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
Document number: DS36542 Rev. 1 - 2
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AP3105NA/NV/NL/NR
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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AP3105NA/NV/NL/NR
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
Document number: DS36542 Rev. 1 - 2
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Absolute Maximum Ratings
Symbol Parameter
(Note 1)
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AP3105NA/NV/NL/NR
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
Document number: DS36542 Rev. 1 - 2
4 of 13
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September 2013
© Diodes Incorporated
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