Image shown is for reference only. Actual package may vary. Refer to the product data sheet for package details. SOT26

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AP3125HB

DCM/CCM Mode Operation with Brownin/out function,100kHz fs max

Datasheet

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Description

The AP3125X is a current mode PWM controller which is optimized for high performance, low standby power and cost effective offline fly-back converters. It is available in SOT26 package.
The PWM switching frequency at normal operation is internally fixed (about 65kHz/100kHz). In middle load, IC will enter green mode to improve system efficiency with the help of frequency fold-back. 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 pins’ fault protection.
The versatile latch/auto functions can be implemented using a minimal number of external components by CTRL pin.

Application(s)

Switching AC-DC Adapter/Charger
ATX/BTX Auxiliary Power
Set-top Box (STB) Power Supply
Open Frame Switching Power Supplys

Specifications & Technical Documents

Product Parameters

Operation Mode	CCM/DCM
HV Start-UpCircuit	N/A
Vcc_MAX(V)	30
UVLOThresholdon/off (V)	15.8/7.6 V
Gate OutputCurrent (mA)	-1 mA
Maximum OscillationFrequency (kHz)	100 (CCM mode) kHz
BNO	Auto-Recover
LOVP	Latch
Release Date	201412

Technical Documents

Calculators

AP3125x-Calculator-Flyback-Design-V1.0.zip (347 KB)

Recommended Soldering Techniques

TN1.pdf

Purchase & Availability

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Product Change Notices (PCNs)

A PCN may only apply to specific orderable part numbers in this datasheet. Please refer to the corresponding PCN to see the exact orderable part number(s) affected.

PCN #	Issue Date	Implementation Date	Subject
PCN-2770	2025-10-30	2025-10-30	Add Fab Site Code, Country of Diffusion (COD) and Assembly Site Origin (ASO) on Product and Shipping Labels for all Diodes Products
PCN-2709	2025-01-07	2025-04-07	Additional Wafer Source (GFAB), Die Revision, Data Sheet Change and Additional Bill of Materials (BOM)