Diodes AP3105NA, AP3105NV, AP3105NL, AP3105NR User Manual

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Description

The AP3105NA/NV/NL/NR is a low startup current, current mode PWM controller with green-mode power-saving operation. The PWM switching frequency at normal operation is set with 65kHz typically and the dithering of frequency will also improve the EMI feature. When the load decreases, the frequency will reduce and when at a very low load, the IC will enter the ‘burst mode’ to minimize switching loss.

About 20kHz frequency switching is to avoid the audible noise as well as reducing the standby loss. The skip mode point can be adjusted through the external resistor connected to the current sense resistor.

The AP3105NA/NV/NL/NR features a lot of functions such as the Leading-Edge Blanking (LEB) of the current sensing, internal slope compensation and several protection functions including cycle-bycycle current limit (OCP), VCC Over Voltage Protection (VOVP), OTP and OLP protection. The versatile latch function can be set by the customer through few components.

This IC is available in SOT-23-6 package.

Features

 Very Low Start-up Current  Current Mode Control  Non-audible-noise Green-mode Control  Skip Mode Adjustable  Internal Slope Compensation  Soft Start During Startup Process  Frequency Fold Back for High Average Efficiency  Secondary Short Winding Protection with FOCP  Soft Switching for Reducing EMI  VCC Maintain Mode  Latch Function for OTP/OVP  Useful Pin Fault Protection:

SENSE Pin Floating CTRL Pin Short to Ground FB/Opto-coupler Open/Short

 Comprehensive System Protection Feature:

VCC Over Voltage Protection (VOVP) Over Load Protection (OLP)

 Mini Size with Packages  Pin to Pin Compatible with AP3103

Pin Assignments

K Package (SOT-23-6)

GND

FB

CTRL

Pin 1 Mark

1

2

34

Applications



Switching AC-DC Adapter/Charger

 ATX/BTX Auxiliary Power  Set-top Box(STB) Power Supply  Open Frame Switching Power Supply

GATE

6

VCC

5

SENSE

COST EFFECTIVE GREEN PWM CONTROLLER

AP3105NA/NV/NL/NR

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Typical Applications Circuit

+

C2

NTC

R7

NTC

VR1

-

~

R3

~

R2

C1

F1

~

R4

R5

U1

VCC

CTRL

SENSE

AP3105NA/

NV/NL/NR

GND

GATE

R14

L2

C8

R15

R16

C9

U2

R17

R18

C3

FB

C4

C11

T1

C5R6

R19

R8

R9

R10

C10

R12R11

R13

C6

C7

AZ431

Pin Descriptions

Pin Number Pin Name Function

1 GND Signal ground. Current return for driver and control circuits

2 FB Feedback. Directly connected to the opto-coupler

Latch trigger if this pin voltage drops below a threshold or over another threshold, leave CTRL pin

3 CTRL

4 SENSE Current Sense

5 VCC Supply voltage of driver and control circuits

6 GATE Gate driver output

open if this function is not needed. Connecting a NTC thermistor to GND can achieve OTP

protection

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Functional Block Diagram

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VCC

FB

GND

15. 5V

8.6V

5

32 V

2

Soft Star t

1

UVLO

28 V

OVP

OSC with

Fr equency J itter

0.5V

1. 25V

2R

R

AP3105NA/NV/NL/NR

UVLO

PWM

VCC _OVP

Burs t

VCC _OVP

FOCP

CTRL_H CT RL_L

OLP

64ms D elay

OLP

Inter nal

Bias

Auto

Recover y

Protection

Latch -off

Protection

DFF

CLK

RB

250 ns LEB

2.5 V

CTRL_H

CT RL_L

0.5 V

13 V

QD

FOCP

OCP

Driver

1. 8V

0.95V

Line

Com pensati on

10 K

100 uA

3. 6V0.6 V

6

4

3

CTRL

GATE

SENSE

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Absolute Maximum Ratings

Symbol Parameter

(Note 1)

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Rating

Unit

VCC

IO

VFB, V

Note 1: Stresses greater than those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated under “Recommended Operating Conditions” is not implied. Exposure to “Absolute Maximum Ratings” for extended periods may affect device reliability.

, V

SENSE

θJA

PD Power Dissipation at TA < +25°C

TJ

T

STG

–

CTRL

Power Supply Voltage 30 V

Gate Output Current 350 mA

Input Voltage to FB, SENSE, CTRL -0.3 to 7 V

Thermal Resistance (Junction to Ambient) 250 °C/W

500 mW

Operating Junction Temperature -40 to +150 °C

Storage Temperature Range +150 °C

ESD (Human Body Model) 3000 V

ESD (Machine Model) 300 V

Recommended Operating Conditions

Symbol Parameter Min Max Unit

VCC

Supply Voltage 10 25 V

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Electrical Characteristics

Symbol Parameter Conditions Min Typ Max Unit

Supply Voltage (VCC Pin)

I

STARTUP

ICC

–

PWM Section/Oscillator Section

–

Current Sense Section (SENSE Pin)

VCS

–

Feedback Input Section (FB Pin)

–

Startup Current – 2 5 20 μA

Operating Supply Current

U

VLO (on)

VCC Maintain

U

VLO (off)

VCC OVP

VCC Clamp ICC=5mA

Maximum Duty Cycle

Oscillation Frequency

Green Mode Frequency

Frequency Temperature

Stability

Frequency Voltage Stability

Frequency Dithering – ±4 ±6 ±8 %

Maximum SENSE Voltage

FOCP Voltage

LEB Time of SENSE

Delay to Output (Note 2)

Soft-start Time

The Ratio of Input Voltage to Current Sense Voltage

Input Impedance

Source Current

Green Mode Threshold

Input Voltage for Zero Duty

(@T

= +25°C, V

A

= 16V, unless otherwise specified.)

CC

=0V, CL=1nF

V

FB

VFB=3V, CL=0nF

–

-20oC to 125oC (Note 2)

V

=12V to 30V

CC

VFB=3.6V

–

V

=0V

FB

–

0.5 0.85 1.2

0.6 1.2 2.0

14.5 15.5 16.5

9.7 10.2 10.7

7.6 8.6 9.6

27 28.5 30

31 34 –

70 75 80 %

60 65 70 kHz

20

– –

0.9 0.95 1 V

1.65 1.8 1.95 V

150 250 350 ns

2.5 3 3.5 V/V

-0.75 -0.5 -0.25 mA

1.3 1.55 1.8 V

–

30 kHz

5 %

– 100 – ns

3 5 8 ms

7 10 13 kΩ

– 2.1 – V

3 %

mA

V

Output Section (GATE Pin)

–

AP3105NA/NV/NL/NR

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Output Low Level

Output High Level

Output Clamping

Rising Time (Note 2)

Falling Time (Note 2)

=20mA, VCC=12V

I

O

=20mA, VCC=12V

I

O

–

=1nF, VCC=13V

C

L

=1nF, VCC=13V

C

L

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– –

8 – – V

11 13 15 V

– 150 250 ns

– 50 100 ns

1 V

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Electrical Characteristics

(Cont.) (@TA = +25°C, V

= 16V, unless otherwise specified.)

CC

Protection Section (CTRL Pin) –

–

Delay Time Section

–

Source Current

Internal Reference Voltage

Low Threshold Trigger for

Latch

High Threshold Trigger for

Latch

Pull-up Current (Note 3)

Delay of Short Circuit Protection

Delay of Hiccup Protection

Note 2: Guaranteed by design.

Note 3: The sourcing current of CTRL pin must be limited below 5mA.Otherwise it may cause permanent damage to the device.

–

– – –

–

VCC OVP – 25 – μs

90 100 110 μA

– 1.5 – V

0.47 0.5 0.53 V

2.35 2.5 2.65 V

54 64 74 ms

2 mA

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Performance Characteristics

Startup Voltage vs. Ambient Temperature Shutdown Voltage vs. Ambient Temperature

18.0

17.5

17.0

16.5

16.0

15.5

15.0

Startup Voltage (V)

14.5

14.0

13.5

13.0

-40 -20 0 20 40 60 80 100 120 140

Startup Current vs. Ambient Temperature Operating Current vs. Ambient Temperature

8.0

7.5

7.0

6.5

6.0

5.5

5.0

4.5

4.0

Startup Current (A)

3.5

3.0

2.5

2.0

-40 -20 0 20 40 60 80 100 120 140

CTRL Utilization for Latch

Ambient Temperature (oC)

10.0

9.5

9.0

8.5

8.0

Shutdown Voltage (V)

7.5

7.0

-40 -20 0 20 40 60 80 100 120 140

3.0

2.5

2.0

1.5

1.0

Operating Current (mA)

0.5

0.0

-40 -20 0 20 40 60 80 100 120 140

Ambient Temperature (oC)

NTC

VCC

CTRL

VCC

CTRL

NTC

VCC

CTRL

NTC

OVP and OTP OVP OTP

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Operation Description

The AP3105NA/NV/NL/NR is specifically designed for off-line ACDC power supply used in LCD monitor, notebook adapter and battery charger applications. It offers a cost effective solution with a versatile protection function.

Start-up Current and UVLO

The start-up current of AP3105NA/NV/NL/NR is optimized to realize ultra low current (5

charged more quickly. The direct benefit of low start-up current is the availability of using large start-up resistor, which minimizes the resistor power loss for high voltage AC input.

An UVLO comparator is included in AP3105NA/NV/NL/NR to detect the voltage on VCC pin. It ensures that AP3105NA/NV/NL/NR can draw adequate energy from hold-up capacitor during power-on. The turn-on threshold is 15.5V and the turn-off threshold is 8.6V.

Current Sense Comparator and PWM Latch

The AP3105NA/NV/NL/NR operates as a current mode controller, the output switch conduction is initiated by every oscillator cycle and is terminated when the peak inductor current reaches the threshold level established by the FB pin. The inductor current signal is converted to a voltage signal by inserting a reference sense resistor

. The inductor current under normal operating conditions is

R

S

controlled by the voltage at FB pin. The relation between peak inductor current (I

Moreover, FOCP with 1.8V threshold is only about 100ns delay, which can avoid some catastrophic damages such as secondary rectifier short test. Few drive cycles can alleviate the destruction range and get better protection.

Leading-edge Blanking

A narrow spike on the leading edge of the current waveform can usually be observed when the power MOSFET is turned on. A 250ns leading-edge blank is built-in to prevent the false-triggering caused by the turn-on spike. During this period, the current limit comparator is disabled and the gate driver can not be switched off.

At the time of turning on the MOSFET, a negative undershoot (maybe larger than -0.3V) can occur on the SENSE pin. So it is strongly recommended to add a small RC filter or at least connect a resistor “R” on this pin to protect the IC (Shown as Figure 1).



A typical) so that VCC capacitor can be

) and VFB is:

PK

RVI 3/)8.0( 

SFBPK

5

VCC

CTRL

3

GND

1

GATE

AP3105NA/

NV/NL/NR

SENSE

FB

6

Necessar y

R

4

C

2

Large under shoot (m ore than

-0. 3 V) m ay damage t he SEN SE pin

Figure 1

Built-in Slope Compensation

It is well known that a continuous current mode SMPS may become unstable when the duty cycle exceeds 50%. The built-in slope compensation can improve the stability, so there is no need for design engineer to spend much time on that.

FB Pin and Short Circuit Protection

This pin is normally connected to the opto-coupler and always paralleled with a capacitor for loop compensation. When the voltage at this pin is greater than 4.2V and lasts for about 64ms, the IC will enter the protection mode. For AP3105NA/NV/NR, the system will enter hiccup mode to wait the V then the IC will try to restart until the failure removed. And when this voltage is less than 1.55V, the IC will stop the drive pulse immediately. Therefore, this feature can be used for short circuit protection, which makes the system immune from damage. Normally, output short makes the V because the opto-coupler is cut off.

V

Maintain Mode

CC

During light load or step load, V thus the PWM drive signal will be stopped, and there is no more new energy transferred due to no switching. Therefore, the IC supply voltage may reduce to the shutdown threshold voltage and system may enter the unexpected restart mode. To avoid this, the AP3105NA/NV/NL/NR hold a so-called V can supply energy to VCC.

When V comparator will output some drive signal to make the system switch and provide a proper energy to VCC pin. The V will cooperate the PWM and burst mode loop which can make the output voltage variation be within the regulation. This mode is very useful for reducing startup resistor loss and achieving a better standby performance with a low value VCC capacitor. The V not easy to touch the shutdown threshold during the startup process and step load. This will also simplify the system design. The normal VCC voltage is suggested to be designed a little higher than V

CC

the standby and step load performance.

decreases to a setting threshold, the VCC maintain

CC

maintain threshold thus can achieve the best balance between

decreasing to low UVLO level,

CC

value to the maximum

FB

will drop and be lower than 1.55V,

FB

maintain mode which

CC

maintain function

CC

is

CC

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Operation Description

System Protection and Pin Fault Protection

The AP3105NA/NV/NL/NR provides versatile system and pin fault protections. The OCP comparator realizes the cycle-by-cycle current limiting (OCP). In universal input line voltage, the IC realizes the constant over load protection (OLP). VCC over voltage protection can be applied as the primary OVP or opto-coupler broken protection. The AP3105NA/NV/NL/NR also has pin fault connection protection including floating and short connection. The floating pin protection include the SENSE, FB, etc.. The short pin protection includes the CTRL pin short protection. When these pins are floated or CTRL pin is shorted to ground, PWM switching will be disabled, thus protecting the power system.

Latch Protection Function

For some applications, the system requires the latch protection function. The CTRL pin has two kinds of modes to trigger the latch protection: high level trigger and low level trigger. The low threshold is 0.5V and high threshold voltage is 2.5V. Some version will have only one mode. Once the latch protection is triggered, the IC will disable the output signal, and the bulk capacitor provides the energy to IC through the startup resistor to ensure the IC disable the output (latch mode). This mode will be not released until the AC input is shut off. So, the de-latch time is mainly depending on the HV startup bulk capacitor value. Therefore, if the system wants a short de-latch time, it is better for the startup resistor take power

(Cont.)

from the point before the rectifier bridge as illustrated in Figure 2.

AC Mains

(90V to 265V)

5

3

2

VCC

CTRL

AP3105NA/NV/ NL/NR

FB

GND

C

BUS

6

GATE

4

SENSE

1

Figure 2

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Ordering Information

Product Version* NA: AP3105NA NV: AP3105NV

Package Part Number Marking ID Packing Type

NL: AP3105NL NR: AP3105NR

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AP3105

-

¯

Circuit Type

AP3105NAKTR-G1 GKN Tape & Reel

G1: Green

TR: Tape & Reel

Package K: SOT-23-6

AP3105NVKTR-G1 GKO Tape & Reel

SOT-23-6

AP3105NLKTR-G1 GKP Tape & Reel

AP3105NRKTR-G1 GKQ Tape & Reel

BCD Semiconductor's products, as designated with "G1" suffix in the part number, are RoHS compliant and green.

*Product Version Classification (with Different Protection Functions)

Product Version Frequency VOVP OLP&SOCP CTRL (Low) CTRL (High)

AP3105NA 65kHz Auto-Recoverable Auto-Recoverable Latch Auto-Recoverable

AP3105NV 65kHz Latch Auto-Recoverable Latch Latch

AP3105NL 65kHz Latch Latch Latch Latch

AP3105NR 65kHz Auto-Recoverable Auto-Recoverable Auto-Recoverable Latch

AP3105NA/NV/NL/NR

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Package Outline Dimensions

0.300(0.012)

0.500(0. 020)

Pin 1 Mark

2.650(0. 104 )

3.000(0. 118 )

(All dimensions in mm(inch).)

SOT-23-6

2.820(0.111)

3.100(0.122)

456

0° 8°

0.200(0.008)

0.300(0.012)

0.600(0.024)

1.500(0.059)

1.700(0.067)

123

0.950(0.037)TYP

1.800(0. 07 1)

2.000(0. 07 9)

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0.700(0.028)REF

0.000(0.000)

0.150(0.006)

0.900(0.035)

1.300(0.051)

1.450(0.057) MAX

0.100(0.004)

0.200(0. 00 8)

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Suggested Pad Layout

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SOT-23-6

EE

G

Z

X

Dimensions

AP3105NA/NV/NL/NR

Document number: DS36542 Rev. 1 - 2

Value 3.600/0.142 1.600/0.063 0.700/0.028 1.000/0.039 0.950/0.037

Z

(mm)/(inch)

G

(mm)/(inch)

X

(mm)/(inch)

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Y

(mm)/(inch)

E

(mm)/(inch)

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DIODES INCORPORATED MAKES NO WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, WITH REGARDS TO THIS DOCUMENT, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE (AND THEIR EQUIVALENTS UNDER THE LAWS OF ANY JURISDICTION).

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Products described herein may be covered by one or more United States, international or foreign patents pending. Product names and markings noted herein may also be covered by one or more United States, international or foreign trademarks.

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Diodes Incorporated products are specifically not authorized for use as critical components in life support devices or systems without the express written approval of the Chief Executive Officer of Diodes Incorporated. As used herein:

A. Life support devices or systems are devices or systems which:

1. are intended to implant into the body, or

2. support or sustain life and whose failure to perform when properly used in accordance with instructions for use provided in the

labeling can be reasonably expected to result in significant injury to the user.

B. A critical component is any component in a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or to affect its safety or effectiveness.

Customers represent that they have all necessary expertise in the safety and regulatory ramifications of their life support devices or systems, and acknowledge and agree that they are solely responsible for all legal, regulatory and safety-related requirements concerning their products and any use of Diodes Incorporated products in such safety-critical, life support devices or systems, notwithstanding any devices- or systems-related information or support that may be provided by Diodes Incorporated. Further, Customers must fully indemnify Diodes Incorporated and its representatives against any damages arising out of the use of Diodes Incorporated products in such safety-critical, life support devices or systems.

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IMPORTANT NOTICE

LIFE SUPPORT

AP3105NA/NV/NL/NR

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