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AP3125R Datasheet

GREEN MODE PWM CONTROLLER

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AP3125R pdf
Description
A Product Line of
Diodes Incorporated
AP3125A/V/L/R
GREEN MODE PWM CONTROLLER
Pin Assignments
The AP3125A/V/L/R is a current mode PWM controller which is
optimized for high performance, low standby power and cost effective
offline flyback converters.
The PWM switching frequency at normal operation is internally fixed
(about 65kHz). In middle load, the IC will enter green mode to
improve system efficiency with the help of frequency foldback. A
minimum switching frequency (about 20kHz) is set to avoid the
audible noise. In no load or light load, the IC will enter the burst mode
to minimize standby power. Furthermore, the frequency dithering
function is built-in to reduce EMI emission.
Internal slope compensation allows more stable Peak-Current Mode
control over wide range of input voltage and load conditions. Internal
line compensation ensures constant output power limit over entire
universal line voltage range.
Comprehensive protection features are included, such as cycle-by-
cycle current limit (OCP), VCC Over Voltage Protection (VOVP),
internal OTP, Over Load Protection (OLP) and pinsfault protection.
The versatile latch functions can be implemented using a minimal
number of external components.
(Top View)
Pin 1 Mark
GND 1
FB 2
CTRL 3
6 GATE
5 VCC
4 SENSE
SOT26
Features
Very Low Start-up Current
Current Mode Control
Non-audible-noise Green-mode Control
Internal Slope Compensation
Soft Start During Startup Process
Frequency Fold Back for High Average Efficiency
Secondary Winding Short Protection with FOCP
Soft Switching for Reducing EMI
VCC Maintain Mode
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)
Optional Latch Mode for VOVP, OLP and CTRL Pin Protection
Mini Size Package of SOT26
Pin to Pin Compatible with AP3105NA/NV/NL/NR
Totally Lead-free & Fully RoHS Compliant (Notes 1 & 2)
Halogen and Antimony Free. GreenDevice (Note 3)
Applications
Switching AC-DC Adapter/Charger
ATX/BTX Auxiliary Power
Set-top Box (STB) Power Supply
Open Frame Switching Power Supply
Notes:
1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2) compliant.
2. See http://www.diodes.com/quality/lead_free.html for more information about Diodes Incorporated’s definitions of Halogen- and Antimony-free, "Green"
and Lead-free.
3. Halogen- and Antimony-free "Green” products are defined as those which contain <900ppm bromine, <900ppm chlorine (<1500ppm total Br + Cl) and
<1000ppm antimony compounds.
AP3125A/V/L/R
Document number: DS36660 Rev. 2 - 2
1 of 13
www.diodes.com
July 2014
© Diodes Incorporated


Diodes Semiconductor Electronic Components Datasheet

AP3125R Datasheet

GREEN MODE PWM CONTROLLER

No Preview Available !

AP3125R pdf
Typical Applications Circuit
C2 R4
R5
C4
R2 R3
NTC
C1
R7
VR1
NTC
U1
VCC
C3
GATE
CTRL SENSE
AP3125A/V/L/R
FB
GND
R8
R9
C11
A Product Line of
Diodes Incorporated
AP3125A/V/L/R
R6 C5
R19
T1
C6
R13
C7
L2
C8
R14
R10
R11 R12
R15
C10
R16
AZ431 C9
R17
R18
Pin Descriptions
Pin Number
1
2
3
4
5
6
Pin Name
GND
FB
CTRL
SENSE
VCC
GATE
Function
Signal ground. Current return for driver and control circuits
Feedback. Directly connected to the opto-coupler
Latch trigger if this pin voltage drops below a threshold or over another threshold, leave CTRL pin
open if this function is not needed. Connecting a NTC thermistor to GND can achieve OTP
protection
Current Sense
Supply voltage of driver and control circuits
Gate driver output
AP3125A/V/L/R
Document number: DS36660 Rev. 2 - 2
2 of 13
www.diodes.com
July 2014
© Diodes Incorporated


Part Number AP3125R
Description GREEN MODE PWM CONTROLLER
Maker Diodes
Total Page 13 Pages
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