TDK 6 650 User Manual

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Data Sheet: MaxetaTM iFA Series

48V Input, 28V Output, 600W Full Brick

Standard Features:

• Industry Standard 600W full brick

• Power density: > 110W/cubic inch

• High efficiency: up to 92%

• Typical efficiency: 90.5% at nominal input and

100% load

• Up to 600W of output power in high ambient temperature with air flow

• Meets basic insulation requirements

• Single wire forced current sharing

• Start-up into pre-biased output bus

• User selectable on/off (either positive or

negative logic)

• Wide output voltage adjustment range

• Auto-recovery protections:

o Input under and over voltage o Current limit o Short circuit o Thermal limit

• Latched output over-voltage protection

• Power good Indication

MAXETA iFA SERIES DC-DC POWER MODULES

The Maxeta series power modules are ideally suited for wireless applications to power various RF power amplifiers. With a typical

90.5% full load efficiency, a power density greater than 110W per cubic inch and a total power and current output capability of 600W and 21.4A respectively, the Maxeta Series offers the highest efficiency, power density and usable output power in a standard full brick package currently available. A wide output voltage trim range, -40% to +10%, remote sensing, power good indication, isolated remote on/off control and single wire active current sharing are standard features enhancing versatility. The Maxeta series power modules are also suited for other telecommunication applications.

• Auxiliary logic output

• High reliability open frame, surface mount

construction

• Base-plate for improved thermal management

• Constant switching frequency

• Optional 0.110” pin length

• UL 60950 (US and Canada), VDE 0805, CB

scheme (IEC950)

• CE Mark (EN60950)

• EMI: CISPR 22 Class A/B with external filters

• Multiple patents pending

• ISO Certified manufacturing facilities

Optional Features

• Short Thru-hole pin 2.794mm (0.110”)

• Output over-voltage signal replaces power

good

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Data Sheet: MaxetaTM iFA Series

Ordering information:

Product

Identifier

i F A 48 021 A 280 V - 0 00

TDK Innoveta Full Brick

Package

Size

Platform Input

Standard Maxeta 

Voltage

36 - 75V 021 – 21.4 Amps 280 – 28V Single

Output

Current/

Power

Output

Units

Main

Output

Voltage

# Of

Outputs

Safety

Class

Feature Set OVP Out

Replaces

Power Good

00 No 0.145”

01 No 0.110”

02 Yes 0.145”

03 Yes 0.110”

Product Offering:

Code Input Voltage Output Voltage Output Current Maximum Output

Power

iFA48021A280V-000 36V to 75V 28V 21.4A 600W 90.5%

iFA48018A280V-000 36V to 75V 28V 18A 504W 91%

Feature Set

00 – Standard >00 – See

option table

Pin Length

Efficiency

3320 Matrix Drive Suite 100 Richardson, Texas 75082

Phone (877) 498-0099 Toll Free (469) 916-4747 Fax (877) 498-0143 Toll Free (214) 239-3101

support@tdkinnoveta.com http://www.tdkinnoveta.com/

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Data Sheet: MaxetaTM iFA Series

Mechanical Specification:

Unless otherwise specified, tolerances are: x.x ± 0.5 mm [x.xx ± 0.02 in.], x.xx +/- 0.25 mm [x.xxx +/- 0.010 in.]

1 2

Recommended hole pattern (top view)

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Data Sheet: MaxetaTM iFA Series

Pin Assignment:

PIN FUNCTION PIN FUNCTION PIN FUNCTION

1 ON/OFF (+) 7 Vout (-) 13 PWR GOOD

2 ON/OFF (-) 8 Vout (+) 14 Parallel Control

3 Vin (+) 9 Vout (+) 15 TRIM

4 Vin (-) 10 Vout (+) 16 SENSE (+)

5 Vout (-) 11 Not present 17 SENSE (-)

6 Vout (-) 12 AUX OUT 18

* Pin base material is copper. The maximum module weight is 250g (8.8 oz).

Heatsink Offering:

Innoveta

Part Number

HS00016 0.50” Transverse 1.00”

HS00017 1.00” Transverse 1.50”

HS00020 0.50” Longitudinal 1.00”

HS00021 1.00” Longitudinal 1.50”

HS00016

HS00017

Transverse Heatsinks Longitudinal Heatsinks

Height Orientation Overall

Module Height

HS00020

HS00021

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Data Sheet: MaxetaTM iFA Series

Absolute Maximum Ratings:

Stress in excess of Absolute Maximum Ratings may cause permanent damage to the device.

Characteristic Min Max Unit Notes & Conditions

Continuous Input Voltage -0.5 80 Vdc

Transient Input Voltage --- 100 Vdc 100mS max.

Isolation Voltage Input to Output Input to Base-plate Output to Base-plate

Storage Temperature -55 125 ˚C

Operating Temperature Range (Tc) -40 115 ˚C

*Engineering Estimate

---

1500 1500

500

Vdc Vdc Vdc

Basic Insulation Basic Insulation Operational Insulation

Measured at the location specified in the thermal measurement figure; maximum temperature varies with output current and module orientation – see curve in the thermal performance section of the data sheet.

Input Characteristics:

Unless otherwise specified, specifications apply over all Rated Input Voltage, Resistive Load, and Temperature conditions.

Characteristic Min Typ Max Unit Notes & Conditions

When 36V ≤ Vin < 38V, the modules will

Operating Input Voltage 36 48 75 Vdc

Maximum Input Current --- 18 20* A Vin = 0 to Vin,max

Input Low End Turn-on Voltage --- 34.9 36 Vdc

Input Low End Turn-off Voltage 30* 32.3 36 Vdc

Hysteresis --- 2.5 --- Vdc

Input Over-voltage Turn-off Voltage --- 79.5 83* Vdc

Input High End Turn-on Voltage 75 78 --- Vdc

Startup Delay Time from application of input voltage --- 10 --- mS

Startup Delay Time from on/off --- 10 --- mS Vin = Vin,nom, Io=Io,max, Tc=25˚C

Output Voltage Rise Time --- 45 60* mS

Inrush Transient --- --- 1 A2 S

Input Reflected Ripple --- 8 20* mApp

Input Ripple Rejection --- 35 --- dB @120Hz

* Engineering Estimate

Caution: The power modules are not internally fused. An external input line fuse with a maximum value of 20A is required. See the Safety Considerations section of the data sheet.

continue to operate, but the output voltage regulation may be out of spec at load > 90% of full load condition

Vo = 0 to 0.1*Vo,nom; on/off =on, Io=Io,max, Tc=25˚C

Io=Io,max, Vo=0.1 to 0.9*Vo,nom, Tc=25˚C

Vin=Vin,nom, Io=Io,max (0 to 20MHz) See input/output ripple measurement figure; BW = 20 MHz

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Data Sheet: MaxetaTM iFA Series

Electrical Data:

iFA48021A280V- 000 through - 003: 28V, 21.4A Output

Characteristic Min Typ Max Unit Notes & Conditions

Output Voltage Initial Set-point

Output Voltage Tolerance

Efficiency

Line Regulation --- 28 56 mV Vin=Vin,min to Vin,max, Io and Tc fixed

Load Regulation --- 28 56 mV Io=Io,min to Io,max, Vin and Tc fixed

Temperature Regulation --- 100 300* mV Tc=Tc,min to Tc,max, Vin and Io fixed

Output Current

Output Current Limiting Threshold

Short Circuit Current

Output Ripple and Noise Voltage

Output Voltage Adjustment Range 60 --- 110 %Vo,nom

Remote Output Voltage Sense Range 0.5* --- --- Vdc

Dynamic Response:

Settling Time to 10% Peak Deviation

Peak Voltage Deviation

Output Voltage Overshoot during Startup 0 0 600* mV Io=Io,max,Tc=25˚C

Switching Frequency --- 175 --- kHz Fixed

Output Over Voltage Protection 31.9* 34.2 35.5* V

External Load Capacitance 450 --- 6,000 ** uF

Isolation Capacitance --- 1000 --- pF

Isolation Resistance 10 --- --- MΩ

Load Share Accuracy -10 --- +10 % 50% to 100% rated load current

Power Good Pin Max Applied Voltage --- --- 35 Vdc Max sink current 5mA

Auxiliary Output Voltage 7.5* 10 13.5* Vdc

* Engineering Estimate ** Contact Innoveta for applications that require additional capacitance or capacitors with very low esr

27.51 28 28.49 Vdc Vin=Vin,nom; Io=Io,max; Tc = 25˚C

27.16 28.84 Vdc Over all rated input voltage, load, and

--- 90.5 --- % Vin=Vin,nom; Io=Io,max; Tc = 25˚C

3.75 --- 21.4 A At loads less than Io,min the module will

22* 24 26* A Vo = 0.9*Vo,nom, Tc<Tc,max, Tc = 25˚C

--- 0.5 --- A Vo = 0.25V, Tc = 25˚C

--- 135 250* mVpp

--- 20 50* mVrms

---

0.5

450

---

temperature conditions to end of life

continue to regulate the output voltage, but the output ripple may increase

Vin=48V, Io≥Io,min, Tc = 25˚C, with a 0.1µF, a 10µF ceramic, and a 470µF low esr aluminum

capacitors located 2 inch away. output ripple measurement figure; BW = 20MHz

Po≤Po,max, refer to “Output Voltage Adjustment” figure for Vin,min requirement

di/dt = 0.1A/uS, Vin=Vin,nom; Tc = 25˚C, load step from 50% to 75% of Io,max. With at least a 10uF ceramic capacitor and a 470uF low esr aluminum or tantalum capacitor across the output terminals.

Minimum ESR > 1mΩ

Max Aux pin current ≤ 20mA Referenced to sense(-) pin.

See input &

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Data Sheet: MaxetaTM iFA Series

Electrical Characteristics: iFA48021A280V- 000 through - 003: 28V, 21.4A Output

(% )

Efficiency,

4 6 8 10121416182022

Output Curre nt (A)

Vin = 36V Vin = 48V Vin = 75V

Typical Efficiency vs. Input Voltage and Load at Ta=25 °C Typical Power Dissipation vs. Input Voltage and Load at Ta=25 °C

28.075

Ta = 25 Deg C.

Po w er Dissipation (W)

4 6 8 10121416182022

Outp ut Curr en t (A)

Vin = 36V V in = 48V V in = 75V

Ta = 25 Deg C.

28.073

28.071

28.069

Output Voltage (V)

28.067

28.065

246810121416182022

Output Current (A)

Vin = 36V Vin = 48V Vin = 75V

Typical Output Voltage vs. Load Current at Ta=25 °

Start-up Characteristics from ON/OFF switch at nominal input and full load. Ch.1: Vout, Ch.3: Vin, Ch.4: Load Current

Start-up Characteristics from input voltage application at full load. Ch.1: Vout, Ch.3: Vin, Ch.4: Load Current

Start-up Characteristics with back-biased voltage at nominal input and 2A load. Turn-on from input voltage application at Ta=25 °C Ch.1: Vout, Ch.3: Vin, Ch. 4: Load Current

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Data Sheet: MaxetaTM iFA Series

Electrical Characteristics (continued): iFA48021A280V- 000 through - 003: 28V, 21.4A Output

Start-up Characteristics with maximum capacitive load (C=7,000uF) from input voltage application at full load. Ch.1: Vout, Ch.3: Vin, Ch.4: Load Current

28.2

28.1

27.9

27.8

Output Voltage (V)

27.7

27.6

37 42 47 52 57 62 67 72 77

Input Voltage (V)

Io_min = 2.2A Io_mid = 10.83A Io_max = 21.79A

Output Voltage vs. Input Voltage (Line Regulation) at Ta=25 °C. Typical Input Start-up Current vs. Load Current at Ta=25 °C

Output Voltage (V)

30 35 40 45 50 55 60 65 70 75

Input Voltage (V)

Io_min = 2.2A Io_mid = 10.83A Io_max = 21.79A

Ta = 25 De g C

Ta = 25 Deg C

Typical Dynamic Load Response. Load step from 50% to 75% of full load, di/dt= 0.1A/uS. (Note: Vin=48V) Ch.1: Output Voltage, Ch. 4: Load Current

Input Current (A)

30 35 40 45 50 55 60 65 70 75

Io_min = 2.2A Io_mid = 10.83A Io_max = 21.79A

Output Voltage (V)

2 7 12 17 22 27

Input Voltage (V)

Output Curre nt (A)

Vin = 36V Vin = 48V Vin = 75V

Ta = 25 Deg C.

Ta = 25 De g C

Typical Output Voltage vs. Input Voltage During Start-up, Ta=25 °C Typical Current Limit vs. Input Voltage at Ta=25 °C

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Data Sheet: MaxetaTM iFA Series

Electrical Characteristics (continued): iFA48021A280V- 000 through - 003: 28V, 21.4A Output

Typical Over-voltage Protection Characteristics at Nominal Input and no load and at Ta=25 °C (Trim-up to cause OVP)

Typical Output Voltage Fall Characteristics at Nominal Input Voltage and no load, at Ta=25 °C. Ch.1: Vout , Ch. 4: Load Current

Output Ripple at Nominal Input Voltage and Full Load, Ta=25 °C Ch. 1: Output Voltage, Ch. 4: Load Current

Conducted EMI (CISPR 22 - B) at Nominal Input and full load Radiated EMI (CISPR 22 - B) at Nominal Input and full load

Typical Load Share Characteristics with two units in parallel operation and one unit turns off. Vin=48V, Io,tot=21A, Ta=25 °C. Ch.1: Vo1, Ch.3: Io1, Ch. 4: Io2

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Data Sheet: MaxetaTM iFA Series

Thermal Performance: iFA48021A280V: 28V, 21.4A Output

O u tp ut C urr e n t (A )

Output Current (A)

30 40 50 60 70 80 90 100 110 120

NC 0.5m/s(100LFM) 1.0m/s(200LFM) 2.0m/s(400LFM) 3.0m/s(6 00LFM)

Max IMS<1.0m/s Max IMS =1. 0m/s Max IMS>1.0m/s

Maximum output current vs. ambient temperature at nominal input voltage for airflow rates natural convection (0.3 m/s (60lfm) to 3.0m/s (600lfm)) with airflow from Vout(+) pins to Vout(-) pins.

Temperature (C)

Thermal Measurement Location

30 40 50 60 70 80 90 100 110 120

NC 0.5m/s(100LFM) 1.0m/s(200LFM) 2.0m/s(400LFM) 3.0m/s(600LFM)

Max IMS< 1. 0m/s Max IMS=1 .0m /s Max IMS>1 .0m/ s

Maximum output current vs. ambient temperature at nominal input voltage for airflow rates natural convection (0.3m/s (60lfm) to 3.0m/s (600lfm)) with airflow from Vout(-) pins to Vout(+) pins.

Temperature (C)

INPUT

Worst Orientation Airflow

Thermal measurement location – top view

The thermal curves provided and the examples given above are based upon measurements made in Innoveta’s experimental test setup that is described in the Thermal Management section. Due to the large number of variables in system design, Innoveta recommends that the user verify the module’s thermal performance in the end application. The thermal measurement location (on the IMS board) should be thermal-coupled and monitored, and should not exceed the temperature limit specified in the de-rating curve above

Best Orientation Airflow

OUTPUT

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Data Sheet: MaxetaTM iFA Series

Thermal Management:

An important part of the overall system design process is thermal management; thermal design must be considered at all levels to ensure good reliability and lifetime of the final system. Superior thermal design and ability to operate in severe application environments are key elements of a robust, reliable power module.

A finite amount of heat must be dissipated from the power module to the surrounding environment. This heat is transferred by the three modes of heat transfer: convection, conduction and radiation. While all three modes of heat transfer are present in every application, convection is the dominant mode of heat transfer in most applications. However, to ensure adequate cooling and proper operation, all three modes should be considered in a final system configuration.

The open frame design of the power module provides an air path to individual components. This air path improves heat conduction and convection to the surrounding environment, which reduces areas of heat concentration and resulting hot spots.

Test Setup:

of the power module is based upon measurements obtained from a wind tunnel test with the setup shown below. This thermal test setup replicates the typical thermal environments encountered in most modern electronic systems with distributed power architectures. The electronic equipment in optical networking, telecom, wireless and advanced computer systems operates in similar environments and utilizes vertically mounted PCBs or circuit cards in cabinet racks.

The power module, as shown in the figure, is mounted on a printed circuit board (PCB) and is vertically oriented within the wind tunnel. The cross section of the airflow passage is rectangular. The spacing between the top of the module or heatsink (where applicable) and a parallel facing PCB is kept at a constant (0.5 in). The

The thermal performance data

power module orientation with respect to the airflow direction can have a significant impact on the module’s thermal performance.

Thermal De-rating

: For proper application

of the power module in a given thermal environment, output current de-rating curves are provided as a design guideline in the

Module Centerline

I R F L O

IRFLOW

76 (3.0)

ir Velocity and Ambient Temperature Measurement Location

ir Passage

Centerline

Wind Tunnel Test Setup Figure Dimensions are in millimeters and (inches).

Thermal Performance section for the power module of interest. The module temperature should be measured in the final system configuration at the location indicated in the thermal measurement location figure to ensure proper thermal management of the power module. In all conditions, the power module should be operated below the maximum operating temperature shown on the de-rating curve. For improved design margins and enhanced system reliability, the power module may be operated at temperatures below the maximum rated

operating temperature

djacent PCB

12.7 (0.50)

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Data Sheet: MaxetaTM iFA Series

Heat transfer by convection can be enhanced by increasing the airflow rate that the power module experiences. The maximum output current of the power module is a function of ambient temperature (T

) and airflow rate as shown in the

AMB

thermal performance figures in the Thermal Performance section. The curves in the figures are shown for natural convection through 3 m/s (600 ft/min). The data for the natural convection condition has been collected at 0.3 m/s (60 ft/min) of airflow, which is the typical airflow generated by other heat dissipating components in many of the systems that these types of modules are used in. In the final system configurations, the airflow rate for the natural convection condition can vary due to temperature gradients from other heat dissipating components.

Heatsink Usage: For applications with demanding environmental requirements, such as higher ambient temperatures or higher power dissipation, the thermal performance of the power module can be improved by attaching a heatsink or cold plate. The iFA platform is designed with a base plate with four M3 X 0.5 throughthreaded mounting fillings for attaching a heatsink or cold plate. The addition of a heatsink can reduce the airflow requirement, ensure consistent operation and extended reliability of the system. With improved thermal performance, more power can be delivered at a given environmental condition.

Standard heatsink kits are available from Innoveta Technologies for vertical module mounting in two different orientations (longitudinal – perpendicular to the direction of the pins and transverse – parallel to the direction of the pins) as shown in the Heatsink Offering section. The heatsink kit contains four M3 x 0.5 steel mounting screws and a precut thermal interface pad for improved thermal resistance between the power module and the heatsink. The screws should be installed using a torquelimiting driver set between 0.35-0.55 Nm (35 in-lbs).

During heatsink assembly, the base-plate to heatsink interface must be carefully

managed. A thermal pad may be required to reduce mechanical-assembly-related stresses and improve the thermal connection. Please contact Innoveta Engineering for recommendation on this subject.

The system designer must use an accurate estimate or actual measure of the internal airflow rate and temperature when doing the heatsink thermal analysis. For each application, a review of the heatsink fin orientation should be completed to verify proper fin alignment with airflow direction to maximize the heatsink effectiveness. For Innoveta standard heatsinks, contact Innoveta Technologies for latest performance data.

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Data Sheet: MaxetaTM iFA Series

Operating Information:

Output Over-Current Protection: The

power modules are equipped with current limit, over-current slow hiccup, and overcurrent trip fast hiccup mode protection. These three protection mechanisms safeguard the module during output overload and short circuit conditions. During overload conditions, the power modules protect themselves by first entering a current limit operation mode by lowering the module output voltage. The relatively long off duration slow hiccup mode current protection circuit is triggered once the filtered peak switch current reaches the preset value. The modules will operate normally once the output current returns to the specified operating range. The fast over-current trip protection is used to protect against short circuit or switch shoot-through conditions. It is a non-latch fast acting protection circuit. The triggering threshold is normally set quite high.

Over-Current Adjustment: The overcurrent limit set point cannot be adjusted externally in this design.

Input Over-voltage Protection: The power modules have an internal protection circuit to help guard against application of over voltage at the input of the power module. The modules shut down to protect themselves when the input line voltage exceeds 75Vdc. When the input overvoltage condition is removed, the unit will auto restart and operate normally.

Input Under-voltage Lockout: The power modules also feature an input under voltage lockout circuitry that ensures that the power module is off at low input voltage levels. The power module will operate normally when the input voltage returns to the specified range.

Output Over-Voltage Protection: The power modules have a protection circuit, independent of the main PWM control loop that reduces the risk of over voltage appearing at the output of the power module during a fault condition. If there is a fault in the main regulation loop, the over voltage

protection circuitry will latch the power module off once it detects the over-voltage condition as specified on the electrical data page. To remove the module from the latched condition, either turn the input power off and back on or reset the remote ON/OFF pins providing that over-voltage conditions have been removed. The reset time of the ON/OFF pins should be 500ms or longer.

Output Over-Voltage Adjustment: The output over-voltage set point cannot be adjusted externally in this design.

Output Under-Voltage Warning: The iFA series power module has internal circuitry to protect against output under-voltage conditions. If an under-voltage condition is present on the output, the module will signal this condition using the “Power Good” pin. There is a delay between the under-voltage condition appearing at the module output and the module switching the “Power Good” pin to high impedance.

Thermal Protection: When the power module exceeds the maximum operating temperature, which is set between 110°C and 120°C, it will turn-off to protect itself against thermal damage. The module will auto restart as soon as it cools down below the recovery temperature, ranging between 90°C and 100°C.

Thermal Warning: There is no thermal warning feature for this design.

Remote On/Off: The iFA series power modules have two remote on/off pins, which are isolated from the input side as well as the output side. To control the power module from the input side, the user must supply a switch between the Vin(-) terminal and the – ON/OFF terminal of ON/OFF pins. A 30KΩ external resistor with 0.5W power rating is recommended to connect between the Vin(+) terminal and the +ON/OFF terminal. The maximum allowable leakage current of the switch is 50uA. The maximum current sinking capability of the ON/OFF terminal is 5mA or less. The current required to maintain the module ON status must be greater than 1mA.

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Data Sheet: MaxetaTM iFA Series

FUSE

+Vin

-Vin

I ON/OFF

+ON/OFF

-ON/OFF

ON/OFF Control from Input Side

An alternative way to control ON/OFF is from the output side by utilizing AUX output pin of the same module. To do so, the user must supply a switch between the module sense(-) terminal and the –ON/OFF terminal of ON/OFF pins. A 2.5 KΩ, 0.1W resistor is recommended to connect between the module AUX pin and the +ON/OFF terminal. The maximum current sinking capability of the ON/OFF terminal is 5mA or less. The current required to maintain the module ON status must be greater than 1mA.

Other methods such as using an external power source and a transistor are also possible. Please consult the field application engineering department of Innoveta Technologies for details.

AUX

-S

+ON/OFF

I ON/OFF

-ON/OFF

ON/OFF Control from Output Side

Output Voltage Adjustment: The output voltage

of the power module is adjustable by

the user using an external resistor or by applying external voltage. However, when the output voltage is increased, the input voltage range is limited as shown in the following figure.

115

Input Limit for Vo,trim

110

105

100

Vo,trim(% Vo,nom)

35 36 37 38 39 40 41 42 43

Vin(V)

To trim the output voltage up, a fixed or variable resistor, Rext1, shall be connected between the Vout(+) pin and the sense(+) pin while the Vout(-) pin and the sense(-) pin should be shorted by a jumper wire as shown below. The trim pin should be left open. The output voltage trim-up rate is approximately 1V / KΩ. To trim the voltage up to 30.8V from 28V, a 2.87KΩ external resistor should be used.

Rext1

S(+)

Vo(+)

Load

Vo(-)

S(-)

Trim

Figure Trim up Connection

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Data Sheet: MaxetaTM iFA Series

If the output voltage adjustment feature is not used, the Vout(+) pin should be shorted to the sense(+) pin and the Vout(-) pin should be shorted to the sense(-) pin by jumper wires.

S(+)

Vo(+)

Load

Vo(-)

S(-)

Trim

Rext2

Figure Trim Down Connection

To trim the output voltage down, a fixed or variable resistor, Rext2, shall be connected between the trim pin and the sense(-) pin while the Vout(-) pin and the sense(-) pin are shorted by a jumper wire. Vout(+) pin and the sense(+) pin should also be shorted by a jumper wire as shown below. The resistor, Rext2, can be chosen according to the following equation:

Rext2

264.69 Vodown⋅ 1006.78548

1081.515138 38.75 Vodown⋅−

−

100000

10000

1000

10 0

Trim Resistance (KΩ)

Trim-down Resistance vs. Vout

16 18 20 22 24 26 28

Output Voltage (V)

In order to trim the output voltage from the minimum value (-40% down) to the maximum value (+10% up) in a linear fashion, a fixed resistor, Rext, should be connected between the trim pin and the sense(-) pin while a 50KΩ variable resistor, Rv, shall be connected between the Vout(+) pin and the sense(+) pin as shown below. When Rext=5.11KΩ and Rv=5.36 KΩ, the voltage trim rate is changed to approximately 0.5V / KΩ starting from

16.8V. The resistor, Rv, should be chosen according to the following equation:

Rv ≅ 1.984 × (Vo_d – 14.122) (KΩ)

where Vo_d is the desired output voltage.

S(+)

Vo(+)

Load

Vo(-)

S(-)

Trim

Rext

Figure Linear Trim Connection

Linear Trim Resistance vs. Vout

34.0

31.0

28.0

25.0

22.0

19 . 0

16 . 0

13 . 0

Trim Resistance (K )

10 . 0

7.0

4.0

16.8 18.8 20.8 22.8 24.8 26.8 28.8 30.8

Output Voltage (V)

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Data Sheet: MaxetaTM iFA Series

The output voltage can also be adjusted within the same range by applying external voltage at the trim pin via a buffer. In this case, Vo_d can be approximately determined by the following formula:

Vo_d ≅ Trim Terminal Voltage × Vo,nom

Contact Innoveta for more details on the voltage trim using an external source.

The maximum power available from the power module is fixed. As the output voltage is trimmed up, the maximum output current must be decreased to maintain the maximum rated power of the module.

As the output voltage is trimmed, the output over-voltage set point is not adjusted. Trimming the output voltage too high may cause the output over voltage protection circuit to be triggered.

Remote Sense: The power modules feature remote sense to compensate for the effect of output distribution drops. The maximum voltage allowed between the output power terminals and output sense terminals is 0.5V. If the remote sense feature is not being used, the sense(+) terminal should be connected to the Vo(+) terminal and the sense(-) pin should be connected to the Vo(-) pin.

The output voltage at the Vo(+) and Vo(-) pins can be increased by either the remote sense or the output voltage adjustment feature. The maximum voltage increase allowed is the larger of the remote sense range or the output voltage adjustment range; it is not the sum of both.

As the output voltage increases due to the use of the remote sense, the maximum output current must be decreased for the power module to remain below the maximum rated power of the module.

Power Good: Normal or abnormal operation of the power module can be monitored using the power good signal. The power good pin provides an open collector signal referenced to the output sense (-) pin

that is pulled low during normal operation of the power module. The power good circuitry will pull the power good pin below 1V while sinking a maximum sink current of 5mA. The maximum allowed voltage to the pin is 35V. In order for the power good to pull low, the following conditions must all be met:

- None of the power module’s protection features have been tripped; the protection features include over-voltage, overcurrent, and over-temperature protection.

- The internal bias voltage is present.

- The internal PWM drive signal is present.

- The output voltage is approximately between 90% and 115% of Vo,nom.

When these conditions are not met, the maximum voltage that will appear at the output of the power good pin can be up to 50V. The typical impedance from the power good pin to ground is greater than 500KΩ.

Power Good signal may give invalid signal during the following conditions:

- Operation of over-current protection

- Light load condition at parallel operation

- Dynamic load operation

Parallel Operation: The iFA series power modules are capable of sharing the load current when multiple units are connected in parallel. The load sharing technique used is the democratic load share scheme. By connecting the PC (or Ishare) pin of each power module with single wire, the output load current can be equally drawn from each module. The voltage at PC pin will range from 0 to 2V, referenced to the output side sense(-). All modules in parallel should be referenced to the same ground with good ground plane.

By setting the output voltage accuracy of each power module in a parallel operation to within ±1%, the load share circuit within the module will force the load current to be shared equally among the multiple modules with ±10% accuracy or better from 50% to 100% of the rated load. The maximum output power rating of each module shall not be exceeded.

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Data Sheet: MaxetaTM iFA Series

Auxiliary Bias Power:

power modules provide an auxiliary output, which is referenced to the output sense (-) pin. It provides an output voltage between

7.5 and 13.5Vdc that can supply a maximum current of 20mA. The auxiliary bias circuitry does not have short circuit protection and may be damaged if over loaded. An internal diode in series with the AUX output pin is provided to protect against reverse voltage up to 75V.

External Synchronization (Optional):

optional feature is available for the iFA series, allowing the power module(s) to be synchronized with an external clock synchronization input from an independent time base. Contact Innoveta for more details on the external clock synchronization feature.

EMC Considerations:

converter modules are designed for use in a wide variety of systems and applications. With the help of external filters and careful layout, it is possible to meet CISPR 22 Class B. For assistance with designing for EMC compliance, please contact Innoveta technical support.

The iFA series

Innoveta DC/DC

Input Impedance: The source impedance

of the input power feeding the DC/DC converter module will interact with the DC/DC converter, which may cause system instability. To minimize the interaction, one or more 100 - 470µF input electrolytic capacitor(s) should be present if the source inductance is greater than 4µH.

Reliability:

The power modules are designed using TDK Innoveta’s stringent design guidelines for component de-rating, product qualification, and design reviews. Early failures are screened out by both burn-in and an automated final test. The MTTF is calculated to be greater than 0.67M hours at nominal input, 80% output power, 0.5” heatsink, 200LFM airflow, and Tc = 80˚C using the Telcordia TR-332 calculation method.

Improper handling or cleaning processes can adversely affect the appearance, testability, and reliability of the power modules. Contact Innoveta technical support for guidance regarding proper handling, cleaning, and soldering of Innoveta’s power modules.

Quality:

TDK Innoveta’s product development process incorporates advanced quality planning tools such as FMEA and Cpk analysis to ensure designs are robust and reliable. All products are assembled at ISO certified assembly plants.

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Data Sheet: MaxetaTM iFA Series

Input/Output Ripple and Noise Measurements:

The input reflected ripple is measured with a current probe and oscilloscope. The ripple current is the current through the 15uH inductor, Lin, with esr ≤ 10 mΩ, feeding a capacitor, C1, esr ≤ 700 mΩ @ 100kHz, across the module input voltage pins. The capacitor C1 across the input shall be at least 100µF/100V. A 470µF/100V or two 220µF/100V capacitors in parallel is recommended. A 220µF/100V capacitor for C0 is also recommended.

The output voltage ripple measurement is made approximately 5 cm (2 in.) from the power module using an oscilloscope

and BNC socket. The capacitor Cext consisting of a 0.1 aluminum electrolytic or tantalum capacitor (esr ≤ 300 mΩ) located about 5 cm (2 in.) from the power module. At Io < Io,min, the module output is not required to be within the output voltage ripple and noise specification.

VsVs

Lin

Safety Considerations:

All TDK Innoveta products are certified to regulatory standards by an independent, Certified Administrative Agency laboratory. UL 1950, 3 other global certifications are typically obtained for each product platform.

The iFA products have the following certifications:

UL 60950 (US & Canada) VDE 0805 CB Scheme (IEC 950) CE Mark (EN60950)

For safety agency approval of the system in which the DC-DC power module is installed, the power module must be installed in compliance with the creepage and clearance requirements of the safety agency. The isolation is basic insulation. For applications requiring basic insulation, care must be taken to maintain minimum creepage and clearance distances when routing traces near the power module.

edition (US & Canada), and

Vi n

Vo ut

Cext

Ground Plane

Load

LoadRLoad

µF and a 10µF ceramic capacitors and at least a 470µF or larger

As part of the production process, the power modules are hi-pot tested from primary and secondary at a test voltage of 1500Vdc.

When the supply to the DC-DC converter is less than 60Vdc, the power module meets all of the requirements for SELV. If the input voltage is a hazardous voltage that exceeds 60Vdc, the output can be considered SELV only if the following conditions are met:

1) The input source is isolated from the ac

mains by reinforced insulation.

2) The input terminal pins are not

accessible.

3) One pole of the input and one pole of

the output are grounded or both are kept floating.

4) Single fault testing is performed on the

end system to ensure that under a single fault, hazardous voltages do not appear at the module output.

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Data Sheet: MaxetaTM iFA Series

To preserve maximum flexibility, the power modules are not internally fused. An external input line normal blow fuse with a maximum value of 20A is required by safety agencies.

A lower value fuse can be selected based upon the maximum dc input current and maximum inrush energy of the power module.

Warranty:

TDK Innoveta’s comprehensive line of power solutions includes efficient, highdensity DC-DC converters. TDK Innoveta offers a three-year limited warranty. Complete warranty information is listed on our web site or is available upon request from TDK Innoveta.

3320 Matrix Drive Suite 100 Richardson, Texas 75082

Phone (877) 498-0099 Toll Free (469) 916-4747 Fax (877) 498-0143 Toll Free (214) 239-3101

support@tdkinnoveta.com http://www.tdkinnoveta.com/

Information furnished by TDK Innovet a is believed to be accurate and reliable. However , TDK Innoveta assumes no

responsibility for its use, nor for any infringement of patents or other rights of thi rd parties, which may result from its use. No

license is granted by implicat ion or otherwise under any patent or patent rights of TDK Innoveta. TDK Innoveta component s

are not designed to be used in applications, such as life support systems, wherein failure or malfunction could result in i njury

or death. All sales are subjec t to TDK Innoveta’s Terms and Conditions of Sale, which are av ailable upon request.

Specifications are subjec t to change without notice.

is a trademark or registered trademark of TDK Corporation.

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TDK 6 650 User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual