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CR6853

Novel Low Cost Green-Power PWM Controller

ChengduChip-RailTech 

CR6853

Novel Low Cost Green-Power PWM Controller

With Low EMI Technique

Feature

Low Cost, PWM&PFM&CRM (Cycle

Reset Mode)

Low Start-up Current (about 1.5µA)

Low Operating Current (about 1.4mA)

Current Mode Operation

Under Voltage Lockout (UVLO)

Built-in Synchronized Slope

Compensation

Built-in Low EMI Technique

Programmable PWM Frequency

Audio Noise Free Operation

Leading edge Blanking on Sense input

Constant output power limiting for

universal AC input Range

SOT-23-6L 、SOP8 and DIP-8 Pb-Free

Applications

Switching AC/DC Adaptor

Battery Charger

Open Frame Switching Power Supply

Packaging

Compatible with SG6848 (6849) /

SG5701/SG5848/LD7535 (7550) /

OB2262 (2263)/OB2278（2279）

Complete Protection with

Soft Clamped GATE output voltage

18.0V

VDD over voltage protect 34.0V

Cycle-by-cycle current limiting

Sense Fault Protection

OTP (Over Temperature Protection)

Output SCP (Short circuit Protection)

Output OLP (Over Load Protection)

Latch mode After OLP&SCP

High-Voltage CMOS Process with ESD

Standby Power Supplies

Set-Top Box Power Supplies

384X Replacement

General Description

The CR6853 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 (Cycle

Reset Mode) under light-load/zero-load

conditions. This can minimize standby

power consumption and achieve power-

saving functions. With a very low start-up

current, the CR6853 could use a large value

start-up resistor (2MΩ).

Built-in synchronized slope compensation

enhances the stability of the system and

avoids sub-harmonic oscillation. Dynamic

peak current 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. Cycle-by-Cycle current

limiting ensures safe operation even during

short-circuit.

Excellent EMI performance is achieved

built-in soft driver and low EMI technique.

The CR6853 offers perfect protection like

OVP(Over Voltage Protection)、OLP(Over

Load Protection) 、 SCP(Short circuit

protection)、OTP、Sense Fault Protection

and OCP(Over current protection). The

CR6853’s output driver is soft clamped to

maximum 18.0V to protect the power

MOSFET. CR6853 is offered in SOT-23-6L,

SOT-8 and DIP-8 packages.

Dec, 2007 V1.1

Chengdu Chip-Rail Tech. Co., Ltd.

1/11

http://www.chiprail.com

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