H6842 Datasheet, PDF (1/6 Pages) Hi-Sincerity Mocroelectronics – Novel Low Cost Green-Power PWM Controller

HI-SINCERITY
MICROELECTRONICS CORP.
Spec. No. : IC200803
Issued Date : 2008.09.10
Revised Date :
Page No. : 1/6
H6842P / H6842S
Novel Low Cost Green-Power PWM Controller
Description
The H6842 is a low startup current, low cost, curren. mode PWM controller with
Green-Power & burst- mode power-saving operation. The integrated functions such
8-Lead Plastic DIP-8
Package Code: P
as the leading-edge blanking of the current sensing, internal slope compensation
provide the users a high efficiency, low external component counts, and low cost
•
solution for AC/DC power applications. The special Green-Power function provides
off-time modulation to linearly decrease the switching frequency under ight-load
conditions. And under zero-load conditions, the power supply enters burst-mode to
8-Lead Plastic SO-8
further reduce power consumption by shutting off PWM output. When the output of
Package Code: S
power supply is short or over loaded, the FB voltage will increase, and if the FB
voltage is higher than 5.2V for longer than 56msec the PWM output will be turned off.
A external NTC resistor connected from pin RT to ground can be applied to over- temperature protection. Pulse by
pulse current limit ensures a constant output current even under short circuit. PWM output will be disabled as long as
VDD exceeds a threshold. When internal latch circuit is used to latch-off the controller the latch wil be reset when
the power supply VDD is disabled
Features
• Low Cost, Green-Power Burst-Mode PWM
• Very Low Start-up Current ( about 7.5uA)
• Low Operating Current ( about 3.0mA)
• Current Mode Operation
• Under Voltage Lockout (UVLO)
• VDD Over Voltage Protection(OVP)
• programmable over-temperature protection
• Internal Latch Circuit(OTP,OVP)
• Built-in soft start with 1ms
• Soft Clamped gate output voltage 16.5V
• VDD over voltage protect 25.5V
• Cycle-by-cycle current limiting
• Output SCP (Short circuit Protection)
• Built-in Synchronized Slope ompensation
• Leading-edge blanking on Sense input
• Programmable PWM Frequency
• High-Voltage CMOS Process with ESD
• DIP-8 & SOP-8 Pb-Free Package
• Compatible with SG6842J&LD7552&
OB2269 & SG6841 & OB2268
Applications
• Power Adaptor
• Battery Charger Adapter
Ordering Information
Part Number
Description
H6842P
DIP-8, Pb-free in Tube
H6842S
SOP-8, Pb-free in Tube
H6842SA
SOP-8,Pb-free in T/R
• Open Frame Switching Power Supply
• LCD Monitor
H6842P, H6842S
HSMC Product Specification