Document
High Precision Off-line Primary-Side PWM Power Switch
OB3396
GENERAL DESCRIPTION
OB3396 is a primary side regulation off-line LED lighting controller which can achieve accurate LED current. It significantly simplifies LED lighting system design by eliminating the secondary side feedback circuitry. Proprietary Constant Voltage (CV) and Constant Current (CC) control is integrated as shown in the figure below. The LED current (CC control) can be adjusted externally by the resistor Rs at SOURCE pin. 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. OB3396 offers comprehensive protection coverage with auto-recovery features including Cycle-by-Cycle current limiting, VDD OVP, VDD clamp and UVLO. Excellent EMI performance is achieved with On-Bright proprietary frequency shuffling technique. OB3396 is offered in DIP8 package.
FEATURES
High Precise Constant Current Regulation at Universal AC input Primary-side Sensing and Regulation Without TL431 and Opto-coupler Programmable CC Regulation Adjustable Constant Current and Output Power Setting Built-in Secondary Constant Current Control with Primary Side Feedback Built-in Adaptive Current Peak Regulation Built-in Primary winding inductance compensation Power on Soft-start Built-in Leading Edge Blanking (LEB) Cycle-by-Cycle Current Limiting VDD Under Voltage Lockout with Hysteresis (UVLO) VDD OVP VDD Clamp
TYPICAL APPLICATION
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Fig.1. Typical CC/CV Curve
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APPLICATIONS
Low Power AC/DC offline SMPS for LED applications
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Preliminary Datasheet OB_DOC_DS_339600
OB3396
High Precision Off-line Primary-Side PWM Power Switch
GENERAL INFORMATION
Pin Configuration The pin map is shown as below for DIP8.
Package Dissipation Rating Package RθJA (℃/W) DIP8 75 Absolute Maximum Ratings Parameter Drain Voltage(off state) VDD Voltage VDD Zener Clamp Continuous Current COMP Voltage CS Input Voltage INV Input Voltage Min/Max Operating Junction Temperature TJ Min/Max Storage Temperature Tstg Lead Temperature (Soldering, 10secs) Value -0.3 to BVdss -0.3 to VDD_clamp 10 mA -0.3 to 7V -0.3 to 7V -0.3 to 7V
COMP
2
7
DRAIN
INV
4
5
CS
Note: Stresses beyond those listed under “absolute maximum Ordering Information Part Number Description OB3396AP DIP8, Pb-free, Tube
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 under “recommended operating conditions” is not implied. Exposure to absolute maximum-rated conditions for extended periods may affect device reliability.
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GND
3
6
SOURCE
-40 to 150 ℃ -55 to 150 ℃ 260 ℃
Preliminary Datasheet OB_DOC_DS_339600
VDD
1
8
DRAIN
OB3396
High Precision Off-line Pri.