Diodes AP3105NA, AP3105NV, AP3105NL, AP3105NR User Manual

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AP3105NA/NV/NL/NR

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

AP3105NA/NV/NL/NR

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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

AP3105NA/NV/NL/NR

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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

AP3105NA/NV/NL/NR

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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

V

V

V

V

Output Section (GATE Pin)

–

–

–

–

–

AP3105NA/NV/NL/NR

Document number: DS36542 Rev. 1 - 2

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

AP3105NA/NV/NL/NR

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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)

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)

Ambient Temperature (oC)

NTC

VCC

CTRL

VCC

CTRL

NTC

VCC

CTRL

NTC

OVP and OTP OVP OTP

AP3105NA/NV/NL/NR

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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

AP3105NA/NV/NL/NR

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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

AP3105NA/NV/NL/NR

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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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AP3105NA/NV/NL/NR

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)

AP3105NA/NV/NL/NR

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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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AP3105NA/NV/NL/NR

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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without further notice to this document and any product described herein. Diodes Incorporated does not assume any liability arising out of the
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This document is written in English but may be translated into multiple languages for reference. Only the English version of this document is the
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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

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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
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Customers represent that they have all necessary expertise in the safety and regulatory ramifications of their life support devices or systems, and
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Copyright © 2013, Diodes Incorporated

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IMPORTANT NOTICE

LIFE SUPPORT

AP3105NA/NV/NL/NR

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