AP3303
QUASI-RESONANT PWM CONTROLLER
Description
Pin Assignments
NEW PRODUCT
The AP3303 is a peak-current control, Quasi-Resonant (QR) PWM
controller which is specially designed for offline power supply that
requires ultra-low standby power, high-power density and
comprehensive protection. It can coordinate with secondary side
USBPD or quick charger controller which can provide a flyback
charger solution.
(Top View)
At no load or light load, the IC will enter the burst mode to minimize
standby power consumption. The minimum switching frequency
(typical: 24kHz) is set to avoid the audible noise. When the load
increases, the IC will enter QR mode with frequency foldback to
improve system efficiency and EMI performance. The maximum
switching frequency (typical: 120kHz) is set to clamp the QR
frequency to reduce switching power loss. Furthermore, the frequency
dithering function is built in to reduce EMI emission.
The AP3303 provides an inner high-voltage start-up function through
HV pin which can reduce the standby loss. Moreover, The AP3303
integrates a VCC LDO circuitry, allowing the LDO to regulate the wide
range VCC_IN to an acceptable value. This makes the AP3303 to be a
good choice in wide range output voltage application.
Internal piecewise linear line compensation ensures constant output
power limit over entire universal line voltage range.
Comprehensive protection features are included, such as brown out
protection, cycle-by-cycle current limit, VCC Over Voltage Protection
(VOVP), Secondary-side Output OVP (SOVP) and UVP (SUVP),
internal OTP, Over Load Protection (OLP) and pins’ fault protection.
SSOP-9 (Type CJ)
Applications
Switching AC-DC Adapter/Charger
ATX/BTX Auxiliary Power
Set-Top Box (STB) Power Supply
Open Frame Switching Power Supply
Combined with Diodes Incorporated’s synchronous controller
APR347, the AP3303 system can achieve the higher power
conversion efficiency and the better thermal performance.
Features
Quasi-Resonant Operation under all Line and Load Condition
Non-Audible-Noise Quasi-Resonant Control
High-Voltage Startup
Embedded VCC LDO to Guarantee Wide Range VCC_IN Voltage
Low VCC Charge Current Reduces Standby Power in Output
Short Situation
Adaptive Burst Mode Operation with Output Voltage
Adaptive Output Power Limit with Output Voltage
Soft Start during Startup Process
Frequency Fold Back for High Average Efficiency
Constant Over Current Protection
Secondary Winding Short Protection with FOCP
Frequency Dithering for Reducing EMI
VCC Maintain Mode
Useful Pin Fault Protection:
SENSE Pin Floating
FB/Opto-Coupler Open/Short
Comprehensive System Protection Feature:
Programmable External OTP
Over Load Protection (OLP)
Brown In/Out Protection
Secondary-Side OVP (SOVP) and UVP (SUVP)
SSOP-9 (Type CJ) is Available
Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
Halogen and Antimony Free. “Green” Device (Note 3)
Notes:
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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