AP3125A
GREEN MODE PWM CONTROLLER
Description
Pin Assignments
The DIODES™ AP3125A is a current mode PWM controller optimized
for high performance, low standby power, and cost-effective offline
flyback converters.
(Top View)
Pin 1 Mark
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.
GND
1
6
GATE
FB
2
5
VCC
CTRL
3
4
SENSE
SOT26 (K Package)
Comprehensive protection features are included, such as cycle-bycycle current limit (OCP), VCC Overvoltage Protection (VOVP),
internal OTP, Overload Protection (OLP), and pins’ fault protection.
The versatile latch functions can be implemented using a minimal
number of external components.
Features
Applications
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 Overvoltage Protection (VOVP)
Overload 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. “Green” Device (Note 3)
For automotive applications requiring specific change
control (i.e. parts qualified to AEC-Q100/101/104/200, PPAP
capable, and manufactured in IATF 16949 certified facilities),
please contact us or your local Diodes representative.
https://www.diodes.com/quality/product-definitions/)
Notes:
Switching AC-DC adaptors/chargers
ATX/BTX auxiliary power
Set-top box (STB) power supplies
Open frame switching power supplies
1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS), 2011/65/EU (RoHS 2) & 2015/863/EU (RoHS 3) compliant.
2. See https://www.diodes.com/quality/lead-free/ 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
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