CL1112 12W恒压-恒流LED电源驱动器

12W High Precision CC/CV Primary-Side PWM Driver

FEATURES

◆ 5% Constant Voltage Regulation, 5%Constant Current Regulation at Universal AC input

◆ Primary-side Sensing and Regulation Without TL431 and Opto-coupler ◆ Low Start-up Current: 5μA (Typical) ◆ Low Operating Current: 2mA (Typical) ◆ Programmable CV and CC Regulation ◆ Adjustable Constant Current and Output Power Setting

◆ Built-in Secondary Constant Current

Control with Primary Side Feedback ◆ Peak-Current-Mode Control

◆ Compensates for transformer inductance tolerances

◆ Compensates for cable voltage drop ◆ Fixed PWM Frequency at 60kHz with

Frequency Hopping to Solve EMI Problems ◆ Power on Soft-start

◆ Built-in Leading Edge Blanking (LEB) ◆ Cycle-by-Cycle Current Limiting ◆ VDD Under-Voltage lockout (UVLO) ◆ VDD Over-Voltage Protection(OVP)

APPLICATIONS

below 12W AC/DC offline SMPS for ◆ Cell Phone Charger

◆ Digital Cameras Charger ◆ Small Power Adapter

◆ Auxiliary Power for PC, TV etc.

◆ Linear Regulator/RCC Replacement

CL1112 is offered in SOP-8 and DIP-8 package.

TYPICAL APPLICATIONS

Pin Configuration

The pin map is shown as below for SOP8/DIP8

CL1112

CL1112

GENERAL DESCRIPTION

CL1112 is a high performance offline PWM driver for low power AC/DC charger and adaptor applications. It operates in primary-side sensing and regulation. Consequently, opto-coupler and

TL431 could be eliminated. Proprietary Constant Voltage (CV) and Constant Current(CC) control

is integrated as shown in the figure below.

In CC control, the current and output power setting can be adjusted externally by the sense resistor Rs at CS pin. In CV control, multi-mode operations are utilized to achieve high performance and high efficiency. In addition, good load regulation is achieved by the built-in cable

drop compensation. Device operates in PFM in CC mode as well at large load condition and it operates in PWM with frequency reduction at light/medium load. CL1112 offers power on soft start control and protection coverage with auto-recovery features including Cycle-by-Cycle current limiting, VDD OVP, VDD clamp and UVLO. Excellent EMI performance is achieved with frequency jittering technique. High precision constant voltage (CV) and constant current (CC) can be achieved by CL1112.

Fig.1. Typical CC/CV Curve

CL1112 PACKAGE DISSIPATION RATING

Package RθJA (℃/W) Marking

CL1112S SOP8 90

CL1112D DIP8 40

ABSOLUTE MAXIMUM RATINGS (note1)

Parameter VALUE

Drain Voltage (off state) -0.3V to Bvdss

VDD Voltage -0.3 to VDD_clamp

10 mA

VDD Zener Clamp

Continuous Current

COMP Voltage -0.3 to 7V

CS Input Voltage -0.3 to 7V

FB Input Voltage -0.3 to 7V

Min/Max Operating

-20 to 150 C

Junction Temperature TJ

-55 to 150 C

Min/Max Storage

Temperature Tstg

260 o C

Lead Temperature

(Soldering, 10secs)

Note: Stresses beyond those listed under “absolute maximum ratings” may cause permanent

damage to the device. These are stress ratings only, functional operation of the device at these or

any other conditions beyond those indicated “recommended operating conditions” is not implied.

Exposure to absolute maximum-rated conditions for extended periods may affect device reliability.