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CR6842, CR6848, CR6848-DIP

Table of contents:
Info of CR6842
Info of CR6848
Info of CR6848-DIP

CR6842, CR6848, CR6848-DIP Selling Leads, Datasheet

MFG:Chip-Rail Package Cooled:SOP-8 D/C:09+/10+

CR6842, CR6848, CR6848-DIP Datasheet download

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Part Number: CR6842

MFG: Chip-Rail

Package Cooled: SOP-8

D/C: 09+/10+

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CR6842 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.

CR6842 Maximum Ratings

Symbol	Parameter		Rating	Unit
V_DD	Supply voltage Pin Voltage		40	V
V_FB	Input Voltage to FB Pin		-0.3 to 6V	V
V_Sense	Input Voltage to SENSE Pin		-0.3 to 6V	V
P_D	Power Dissipation		1000	mW
	ESD Capability, HBM Model		2000	V
	ESD Capability, Machine Model		200	V
T_L	Lead Temperature(Soldering)	DIP-8(10sec)	260 230
		SOP-8(10sec)
T_STG	Storage Temperature Range		-55 to + 150

CR6842 Features

` Low Cost, Green-Power Burst-Mode PWM
` Very Low Start-up Current ( about 7.5A)
` 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
` Built-in Frequency jitter for better EMI Signature
` Soft Clamped gate output voltage 16.5V
` VDD over voltage protect 25.5V
` Cycle-by-cycle current limiting
` Sense Fault Protection
` Output SCP (Short circuit Protection)
` Built-in Synchronized Slope Compensation
` 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

CR6842 Typical Application

· Power Adaptor
· Battery Charger Adapter
· Open Frame Switching Power Supply
· LCD Monitor

CR6842 Connection Diagram

CR6848 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.

CR6848 Maximum Ratings

Symbol	Parameter		Rating	Unit
V_DD	Supply voltage Pin Voltage		40	V
I_OVP	VDD OVP maximal enter current		20	mA
V_FB	Input Voltage to FB Pin		-0.3 to 6V	V
V_SEN	Input Voltage to SEN Pin		-0.3 to 6V	V
P_D	Power Dissipation		300	mW
	ESD Capability, HBM Model		2000	V
	ESD Capability, Machine Model		200	V
T_L	Lead Temperature (Soldering)	20 second SOT-23-6L	220
T_L	Lead Temperature (Soldering)	10 second DIP-8	260
T_STG	Storage Temperature Range		-55 to + 150

CR6848 Features

` Low Cost, PWM&PFM&CRM
` Low Start-up Current (about 10A)
` Low Operating Current (about 2mA)
` Current Mode Operation
` Under Voltage Lockout (UVLO)
` Built-in Synchronized Slope Compensation
` Programmable PWM Frequency
` Leading edge Blanking on Sense input
` Constant output power limiting for universal AC input
` Cycle-by-cycle current limiting
` Clamped gate output voltage 16.5V
` Over voltage protect 26.7V
` High-Voltage CMOS Process with ESD
` SOT-23-6L,SOP-8 & DIP-8 Pb-Free Packaging
` Compatible with SG5701 & SG5848 & LD7535 &OB22632/63

CR6848 Typical Application

· Switching AC/DC Adaptor
· Battery Charger
· Open Frame Switching Power Supply
· 384X Replacement

CR6848 Connection Diagram

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