TDK Maxeta iFA Series User Manual

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Advance Data Sheet: MaxetaTM iFA Series

24V Input, 28V Output, 602W Full Brick

Standard Features:

• Industry Standard Full Brick

• Power density: > 108W / cubic inch

• High efficiency: up to 92%

• Nominal input efficiency: 89% at 100% load

• Nominal input efficiency: 90% at 80% load

• Up to 602W of output power in high ambient

• Meets basic insulation requirements

• Voltage foldback constant current limit

• 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 Short circuit o Thermal limit

• Latched output over-voltage protection

• High reliability open frame, SMT construction

• Base-plate for improved thermal management

Maxeta iFA Series DC-DC Power Modules

The Maxeta iFA series power modules are ideally suited for wireless applications to power RF power amplifiers. With a typical 89% full load efficiency (90% at 80% load), a power density of 108W per cubic inch and a total power and current output capability of 602W and 21.5A respectively, the Maxeta Series offers the highest efficiency, power density and usable output power for 24V input applications in a standard full brick package currently available. A wide output voltage trim range, 40% to +10%, remote sensing, and isolated remote on/off control are standard features enhancing versatility. The Maxeta iFA series power modules are also suited for other telecommunication applications.

• Constant switching frequency

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

scheme (IEC950)

• CE Mark (EN60950)

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

• US 6,618,274. Other patents pending

• ISO Certified manufacturing facilities

Optional Features

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

• Thru-hole PEM studs for ease of mounting

• Single wire current sharing (optional)

• Power good Indication (optional)

• Auxiliary logic (10V) output (optional)

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TDK Innoveta Inc.

Advance Data Sheet: MaxetaTM iFA Series

Ordering information:

Product

Identifier

i F A 24 021 A 280 V -

TDK Innoveta Full Brick

Package

Size

Platform Input

Standard Maxeta 

Voltage

19 - 36V 021 – 21.5 Amps 280 – 28V Single

Feature

Set

00 No 0.145” Threaded No

01 No 0.110” Threaded No

02 Yes 0.145” Threaded No

03 Yes 0.110” Threaded No

20 No 0.145” Thru-hole No

26 No 0.200” Thru-hole Yes

OVP Out

Replaces

Power

Good

Product Offering

Code Input Voltage Output Voltage Output Current Maximum Output

iFA24021A280V-020 19V to 36V 28V 21.5A 602W 89%

iFA24018A280V-020 19V to 36V 28V 18A 504W 90%

Output

Current/

Power

Pin Length PEM Stud

Output

Units

Main

Output

Voltage

Style

# Of

Outputs

(Voltage foldback constant current limit, no

load share, no Power Good, no Aux Output)

Safety

Special Code

Power

Class

Feature Set

0 00

00 – Standard >00 – See

option table

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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Advance 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)

141516

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Advance 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

TDK 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”

Height Orientation Overall

HS00016

HS00017

Transverse Heatsinks Longitudinal Heatsinks

Module Height

HS00020

HS00021

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Advance 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 40 Vdc

Transient Input Voltage --- 50 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

---

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

Operating Input Voltage 19

Input Current --- 28.2 37 A Vin = 0 to Vin,max

Input Low End Turn-on Voltage --- 17.9 19 Vdc

Input Low End Turn-off Voltage --- 16.1 19 Vdc

Hysteresis --- 1.8 --- Vdc

Input Over-voltage Turn-off Voltage --- 38.6 --- Vdc

Input High End Turn-on Voltage 36 37.6 --- Vdc

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

Startup Delay Time from on/off --- 8 --- mS Vin = Vin,nom, Io=Io,max, Tc=25˚C

Output Voltage Rise Time --- 42 60* mS

Inrush Transient --- --- 1* A2 S

Input Reflected Ripple --- 5 --- mApp

Input Ripple Rejection --- 41 --- dB @120Hz

* Engineering Estimate

Telecom 24V battery plant voltage is typically set at 27.24V

Caution: The power modules are not internally fused. An external input line fuse with a maximum value of 40A is required. See the Safety Considerations section of the data sheet.

(28)

36 Vdc

When 18V ≤ Vin < 19V, the modules will continue to operate, but the output voltage regulation may be out of spec at full load condition

Vo = 0 to 0.1*Vo,nom; 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 = 5 MHz

on/off =on,

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Advance Data Sheet: MaxetaTM iFA Series

Electrical Data

iFA24021A280V- 000 through - 026: 28V, 21.5A, 602W Output

Characteristic Min Typ Max Unit Notes & Conditions

Output Voltage Initial Set-point

Output Voltage Tolerance

Efficiency

Line Regulation --- 20 56 mV Vin=Vin,min to Vin,max, Io and Tc fixed

Load Regulation --- 10 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 --- mV Io=Io,max,Tc=25˚C

Switching Frequency --- 150 --- kHz Fixed

Output Over Voltage Protection 31.9 34 35.5* V

External Load Capacitance 450 --- 7,000 ** uF

Isolation Capacitance --- 1000 --- pF

Isolation Resistance 15 --- --- MΩ

Load Share Accuracy --- --- --- % Optional feature

Power Good Pin Max Applied Voltage --- --- --- Vdc Optional feature

Auxiliary Output Voltage --- --- --- Vdc Optional feature

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

27.30 28 28.42 Vdc Vin=Vin,nom; Io=Io,max; Tc = 25˚C

27.02 28.70 Vdc Over all rated input voltage, load, and

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

0.22 --- 21.5 A At loads less than Io,min the module will

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

--- 1.4 --- A Vo = 0.25V, Tc = 25˚C

--- 60

--- 13 50* mVrms

---

120

200

150* mVpp

---

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, two 220µF 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 two 220uF low esr aluminum or tantalum capacitors across the output terminals.

Minimum ESR > 1.5mΩ

ee input &

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E ffic ie n c y ( % )

P o w e r D is s ip a tio n (W )

O u t p ut V o lta g e ( V )

Advance Data Sheet: MaxetaTM iFA Series

Electrical Characteristics:

iFA24021A280V- 000 through - 026: 28V, 21.5A, 602W Output

4 5 6 7 8 9 10 11 12 1 3 14 15 16 17 18 19 20 21

Output Current (A)

Vin = 19V Vin = 24V Vin = 36V Vin = 32V

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

27.97

27.965

27.96

27.955

27.95

27.945

27.94

2 3 4 5 6 7 8 9 10 11 12 13 1 4 15 16 17 18 19 20 21

Output Current (A)

4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21

Output Current (A)

Vin = 19V Vin = 24V Vin = 36V V in = 32V

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

Vin = 19V Vin = 24V Vin = 36V Vin = 32V

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

Start-up from input voltage application at nominal Vin and full load. Ch. 1: Vo Ch. 2: ON/OFF Ch. 3: Vin Ch. 4: Io

Start-up from ON/OFF switch at nominal Vin and full load. Ch.1: Vo Ch. 2: ON/OFF Ch.3: Vin Ch.4: Io

Typical Output Voltage Fall Characteristics at Vin=24V, Io=21.5A Ch. 1: Vo Ch. 2: ON/OFF Ch. 3: Vin Ch. 4: Io

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O u t p ut V olta ge ( V )

Advance Data Sheet: MaxetaTM iFA Series

Electrical Characteristics:

iFA24021A280V- 000 through - 026: 28V, 21.5A, 602W Output

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

Dynamic Load Response. Load step from 50% to 75% of full load with 0.1A/uS (Vin=nominal). Ch.1: Vo Ch. 4: Io

In pu t C u r r e n t (A )

14 16 18 20 22 24 26 28 30 32 34 36

Input Voltage (V)

Dynamic Load Transient. Load step from 33% to 66% of full load with 200Hz High Slew Rate Ch.1: Vo Ch. 4: Io

27.98

27.975

27.97

27.965

27.96

27.955

27.95

19 21 23 25 27 2 9 31 33 3 5 37

Io_min = 2.1A Io_mid = 10.6A Io_max = 21.1A

Output Voltage vs. Input Voltage (Line Regulation) at Ta=25 °C.

Input Voltage (V)

Io_min = 2.1A Io_mid = 10.6A Io_max = 21.1A

Input Start-up Current vs. Line and Load Current at Ta=25 °C

O utput V olta ge (V )

2 4 6 8 10 12 14 16 18 20 22 24 2 6 28 30

Output Current (A)

Vin = 19V V in = 24V V in = 36V Vin = 32V

Typical Current Limit vs. Input Voltage at Ta=25 °C

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Advance Data Sheet: MaxetaTM iFA Series

Thermal Performance

Ou tput C urre nt (A )

25 35 4 5 55 65 75 85 95 105 115 125

NC 0.3 m/s (60 LFM) 0.5 m/s (100 LFM) 1.0 m/s (200 LFM) 1.5 m/s (300 LFM)

2.0 m/s (400 LFM) 3.0 m/s (600 LFM) Max IMS Temp

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.

iFA24021A280V- 000 through - 026: 28V, 21.5A, 602W Output

Ambient Temperature (C)

Thermal Measurement Location

Outp ut Cu rrent (A )

25 35 45 55 6 5 7 5 85 95 105 115

NC 0.3 m/s (60 LFM) 0.5 m/s (100 LFM) 1.0 m/s (200 LFM) 1.5 m/s (300 LFM)

2.0 m/s (400 LFM) 3.0 m/s (600 LFM) Max IMS Temp

Ambient Temperature (C)

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.

Best

INPUT

OUTPUT

Orientation Airflow

Worst Orientation Airflow

Thermal measurement location – top view

The thermal curves provided are based upon measurements made in TDK Innoveta’s experimental test setup that is described in the Thermal Management section. Due to the large number of variables in system design, TDK Innoveta recommends that the user verify the module’s thermal performance in the end application. The critical component should be thermo- coupled and monitored, and should not exceed the temperature limit specified in the derating curve above. It is critical that the thermocouple be mounted in a manner that gives direct thermal contact otherwise significant measurement errors may result.

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AIRFLOW

12.7

Module

Adjacent PCB

76 (3.0)

Wind Tunnel Test Setup Figure

Advance 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 the 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 convection cooling to the surrounding environment, which reduces areas of heat concentration and resulting hot spots.

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

The power module is mounted on a 0.062 inch thick, 6-layer, 2oz/layer PCB and is vertically oriented within the wind tunnel. Power is routed on the internal layers of the PCB. The outer copper layers are thermally decoupled from the converter to better simulate the customer’s application. This also results in a more conservative derating.

The cross section of the airflow passage is rectangular with the space between the top of the module or heatsink (where applicable) and a parallel facing PCB is kept at a constant (0.5 in). The power module’s orientation with respect to the airflow direction can have a significant impact on the unit’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

Centerline

I R F L O

Air Velocity and Ambient Temperature Measurement Location

Air Passage Centerline

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 to ensure proper thermal management of the power module. For thermal performance verification, the module temperature should be measured at the location indicated in the thermal measurement location figure on the Thermal

(0.50)

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Advance Data Sheet: MaxetaTM iFA Series

Performance page for the power module of interest. In all conditions, the power module should be operated below the maximum operating temperature shown on the derating curve

For improved design margins and enhanced system reliability, the power module may be operated at temperatures below the maximum rated operating temperature.

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. A non-threaded version is also available. 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 TDK Innoveta 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 torque-limiting driver set between 0.35-0.55 Nm (3-5 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 TDK 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 TDK Innoveta standard heatsinks, contact TDK Innoveta Inc. for latest performance data.

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Advance 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 36Vdc. 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, 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.

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 15KΩ external resistor with 0.25W or more 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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Advance Data Sheet: MaxetaTM iFA Series

FUSE

+Vin

-Vin

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, 0.125W 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 TDK Innoveta Inc for details.

AUX

-S

+ON/OFF

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.

Vin Limit for Trim-up

115

110

105

100

Vo, trim (%Vo,nom)

18 19 20 21 22 23 24 25

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 needs be used.

Rext1

S(+)

Vo(+ )

Load

Vo(-)

S(-)

Trim

Figure Trim up Connection

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Trim Res istanc e (KΩ)

Advance 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

Vo_down 0.331

4.787591 0.171506Vo_down−

Trim-dow n Resistance vs. V out

10000

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, the voltage trim rate is changed to approximately 0.459V / KΩ starting from 16.8V. The resistor, Rv, should be chosen according to the following equation:

Rv ≅ 2.17833 × (Vo_d – 12.862) (KΩ)

where Vo_d is the desired output voltage.

R v

S(+ )

Vo (+)

C o

Load

Vo (-)

S(- )

Trim

Rext

Fig u r e Linear Trim C on n ecti on

40.0

Linear Trim Res is tance vs. Vout

1000

100

16 18 20 22 24 26 28

Output Voltage (V)

36.0

32.0

28.0

24.0

20.0

16.0

Trim Resistance (K )

12.0

8.0 16 19 22 25 28 31

Output Voltage (V)

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Advance 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 (Optional): 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 (Optional): 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 within ±10% accuracy from 50% to 100% of the rated load. The maximum output power rating of each module shall not be exceeded.

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Auxiliary Bias Power (Optional):

series 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.

Innoveta DC/DC

The iFA

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, two or more 470µF / 50V input electrolytic capacitor(s) should be present if the source inductance is greater than 4µH.

Reliability:

The power modules are designed using 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 MTBF is calculated to be greater than 1.5M input, 100% output power, 0.5” heatsink, 200LFM airflow, and Ta = 40˚C using the Telcordia TR-332 issue 6 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.

hours at nominal

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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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 ≤ 350 mΩ @ 100kHz, across the module input voltage pins. The capacitor C1 across the input shall be at least two (2) 470µF/50V capacitors in parallel. A 470µF/50V 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 ≤ 200 mΩ) in parallel 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

Vin

F and a 10µF ceramic capacitors and at least two (2) 220µF/50V

Vout

Cext

Ground Plane

Load

LoadRLoad

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

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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Advance 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 40A 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 Innoveta 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 third parties, which may result from its use. No license is granted

by implication or otherwise under any patent or patent rights of TDK Innoveta. TDK Innoveta components are not designed to be

used in applications, such as life support systems, wherein failure or malfunction could result in injury or death. All sales are

subject to TDK Innoveta’s Terms and Conditions of Sale, which are available upon request. Specifications are subject to change

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TDK Maxeta iFA Series User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual