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電子部品 CR6848 Datasheet 詳細情報 ( 特性, スペック, ピン接続図 )

部品番号 CR6848
部品説明 Npvel Low Cost Green-Power PWM Controller
メーカ Chip Rail
ロゴ Chip Rail ロゴ 
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CR6848 Datasheet, CR6848 PDF,ピン配置, 機能
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CR6848
Novel Low Cost Green-Power PWM Controller
Features
z Low Cost, PWM&PFM&CRM
z Low Start-up Current (about 10µA)
z Low Operating Current (about 2mA)
z Current Mode Operation
z Under Voltage Lockout (UVLO)
z Built-in Synchronized Slope
Compensation
z Programmable PWM Frequency
z Leading edge Blanking on Sense input
z Constant output power limiting for
universal AC input
z Cycle-by-cycle current limiting
z Clamped gate output voltage 16.5V
z Over voltage protect 26.7V
z High-Voltage CMOS Process with ESD
z SOT-23-6L SOP-8 & DIP-8 Pb-Free
Packaging
z Compatible with SG5701 & SG5848 &
LD7535 &OB22632/63
Applications
z Switching AC/DC Adaptor
z Battery Charger
z Open Frame Switching Power Supply
z 384X Replacement
General Description
The CR6848 is a highly integrated low cost
current mode PWM controller, which is ideal
for small power current mode of offline
AC-DC fly-back converter applications.
Making use of external resistors, the IC
changes the operating frequency and
automatically enters the PFM/CRM under
light-load/zero-load conditions. This can
minimize standby power consumption and
achieve green-power functions. With a very
low start-up current, the CR6848 could use
a large value start-up resistor (1.5Mohm).
Built-in synchronized slope compensation
enhances the stability of the system and
avoids sub-harmonic oscillation. Dynamic
peak limiting circuit minimizes output power
change caused by delay time of the system
over a universal AC input range. Leading
edge blanking circuit on current sense input
could remove the signal glitch due to
snubber circuit diode reverse recovery and
thus greatly reduces the external
component count and system cost in the
design. Pulse-by-pulse current limiting
ensures safe operation even during
short-circuit.
The CR6848 offers more protection like
OVP (Over Voltage Protection) and OCP
(Over current protection). The CR6848’s
output driver is clamped to maximum 16.5V
to protect the power MOSFET. Excellent
EMI performance is achieved soft switching
control at the totem pole gate driver output.
CR6848 is offered in SOT-23-6, SOP-8 and
DIP-8 packages.
Dec, 2006 V1.5
Chengdu Chip-Rail Tech.Co.Ltd.
1/14
http://www.chiprail.com

--------------------------------------------
CR6848 pdf, 電子部品, 半導体, ピン配列
www.DataSheet4U.com
CR6848
Pin Assignment
Pin Descriptions
Name
GND
FB
RI
SEN
VDD
GATE
GND Pin
Description
Analog Input. Voltage feedback pin (same as the COMP pin in UC384X),
This pin is to program the switching frequency. By connecting a resistor
to ground to set the switching frequency.
Current sense pin, connect to sense the MOSFET current.
Supply voltage pin.
Gate output to drive the external power MOSFET.
Block Diagram
Simplified Internal Circuit Architecture
Dec, 2006 V1.5
Chengdu Chip-Rail Tech.Co.Ltd.
3/14
http://www.chiprail.com





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