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AP3127H (NRND)

NRND = Not Recommended for New Design

Cost Effective Flyback PWM Controller for Quick Charge Application

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Description

The AP3127H is a current mode PWM controller which is optimized for high performance, low standby power and cost effective offline flyback converters. The AP3127H coordinating with Diodes’ secondary side controller AP4320 and protocol decoding IC AP4370 provide a Flyback charger/adapter solution compatible to Qualcomm Quick Charge 2.0 protocol.

The PWM switching frequency at normal operation is internally fixed (about 100kHz for AP3127H). 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), V_CC Over Voltage Protection (VOVP), internal OTP, Over Load Protection (OLP) and pins’ fault protection. AP3127H combines secondary side OVP (SOVP) and UVP.

Feature(s)

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
V_CC Maintain Mode
Useful Pin Fault Protection:
- SENSE Pin Floating
- FB/Opto-coupler Open/Short
Comprehensive System Protection Feature:
- V_CC Over Voltage Protection (VOVP)
- Over Load Protection (OLP)
Secondary Side OVP (SOVP) and UVP
Mini Size Package of SOT26
Totally Lead-free & Fully RoHS Compliant
Halogen and Antimony Free. “Green” Device

Application(s)

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

Product Specifications

Product Parameters

BNO	N/A
CTRL Pin High	SOVP
CTRL Pin Low	SUVP
Gate OutputCurrent (mA)	350
HV Start-UpCircuit	No
LOVP	N/A
Maximum OscillationFrequency (kHz)	100
StartupCurrent (µA)	1
UVLOThresholdon/off (V)	15.5/7.6
VOVP	Auto-Recover

Technical Documents

Recommended Soldering Techniques

TN1.pdf

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-2594	2022-08-31	2023-02-28	Device End of Life (EOL)