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データシート CR6842 PDF ダウンロード


電子部品 CR6842 Datasheet 詳細情報 ( 特性, スペック, ピン接続図 )

部品番号 CR6842
部品説明 Green Power PWM Controller
メーカ Chip Rail
ロゴ Chip Rail ロゴ 
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CR6842 Datasheet, CR6842 PDF,ピン配置, 機能
CR6842
Green-Power PWM Controller with Freq. Jittering
Features
z Low Cost, Green-Power Burst-Mode PWM
z Very Low Start-up Current ( about 7.5µA)
z Low Operating Current ( about 3.0mA)
www.DataSheet4U.zcom Current Mode Operation
z Under Voltage Lockout (UVLO)
z VDD Over Voltage Protection(OVP)
z programmable over-temperature protection
z Internal Latch Circuit(OTP,OVP)
z Built-in soft start with 1ms
z Built-in Frequency jitter for better EMI Signature
z Soft Clamped gate output voltage 16.5V
z VDD over voltage protect 25.5V
z Cycle-by-cycle current limiting
z Sense Fault Protection
z Output SCP (Short circuit Protection)
z Built-in Synchronized Slope Compensation
z Leading-edge blanking on Sense input
z Programmable PWM Frequency
z High-Voltage CMOS Process with ESD
z DIP-8 & SOP-8 Pb-Free Package
z Compatible with SG6842J&LD7552&OB2269
Applications
z Power Adaptor
z Battery Charger Adapter
z Open Frame Switching Power Supply
z LCD Monitor
General Description
The CR6842 is a low startup current , low cost, current
mode PWM controller with Green-Power & burst-mode
power-saving operation. The integrated functions such 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 light-load conditions. And
under zero-load conditions, the power supply enters
burst-mode to further reduce power consumption by
shutting off PWM output. When the output of 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 will be reset when
the power supply VDD is disabled.
Dec.2006 V 1.3
Chengdu Chip-Rail Tech.Co.,Ltd
1

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CR6842 pdf, 電子部品, 半導体, ピン配列
CR6842
Block Diagram
VIN
0.9V
RI
Current
Reference
Soft
Driver
VDD
GATE
www.DataSheet4U.com
RT
OTP
PWM
LATCH
Internal
BIAS
OSC
S
R
VDD
UVLO
OVP
Burst Mode
Controller
Green Mode
Controller
56ms
Debounce
5.2V
GND
Blanking
Circuit
SENSE
Slope Compensation
FB
Absolute Maximum Ratings
Symbol
VDD
VFB
VSense
PD
TL
TSTG
Parameter
Supply voltage Pin Voltage
Input Voltage to FB Pin
Input Voltage to SENSE Pin
Power Dissipation
ESD Capability, HBM Model
ESD Capability, Machine Model
Lead Temperature(Soldering)
Storage Temperature Range
DIP-8 10sec
SOP-8 10sec
Rating
40
-0.3 to 6V
-0.3 to 6V
1000
2000
200
260
230
-55 to + 150
Unit
V
V
V
mW
V
V
Dec.2006 V 1.3
Chengdu Chip-Rail Tech.Co.,Ltd
3





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