HT7A6003 Datasheet, PDF (1/11 Pages) Holtek Semiconductor Inc – EMI-Improved Green Mode PWM Controller with Integrated Protections

HT7A6003
EMI-Improved Green Mode PWM
Controller with Integrated Protections
Feature
• Frequency jitter for restraining EMI
• Integrated Soft-Start function
• Very low operating current and start-up current
(<20mA) for satisfying Energy-Star 2.0 "No-Load
Mode" (Stand-by) power standard
• ±5% trimmed oscillator for precise frequency
• Programmable switching frequency
• Non-audible-noise Green Mode Control
• LEB (Leading-Edge Blanking) on CS pin
• Internal slope compensation
• Cycle-by-Cycle current limiting
• Short-Circuit-Protection(SCP) for Short-Circuit
and Over-Load condition
• Over-Voltage-Protection(OVP) on VCC Pin
• 8-Pin SOP package
Applications
• Switching AC-DC adaptor
• Open frames switching power supply
• UPS
• LCD TV
General Description
HT7A6003 is an advanced, highly integration Off-
Line PWM Controller. This device provides many
protection functions with ultra low power circuit
design, and is optimized for restraining EMI. By
integrated a Non-Audible Noise Green Mode Control
Scheme and optimizing for the Energy Star 2.0 spec.,
the Power Supply Unit (PSU) implemented using
the HT7A6003 can satisfy the “Energy Star No-
Load Mode” Stand-by Power standard, which is
less than 0.3W within all Nameplate Output Power
Range of 0~250W. This device also integrated various
protection functions such as Short-Circuit Protection
(SCP, which can also be used for Over-Load
Protection, OLP), Cycle-by-Cycle Current Limiting,
Over Voltage Protection (OVP), and Soft-Start
function for reducing inrush current during system
initialization and preventing device burn-out.
The HT7A6003 also integrates Leading-Edge
Blanking and Slope Compensation for minimizing
external components cost and system complexity.
Application Circuits
EMI Filter
Flyback Converter
VOUT
GND
GD
RT
10k
CS
VCC
HT7A6003 _COMP
GND
VREF
0.1uF
FOD817
95k
TL431
25k
Rev. 1.00
1
May 27, 2011