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OB3396 Datasheet

High Precision Off-line Primary-Side PWM Power Switch

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High Precision Off-line Primary-Side PWM Power Switch
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.
„ 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
„ Power on Soft-start
„ Built-in Leading Edge Blanking (LEB)
„ Cycle-by-Cycle Current Limiting
„ VDD Under Voltage Lockout with Hysteresis
„ VDD Clamp
Low Power AC/DC offline SMPS for
„ LED applications
Fig.1. Typical CC/CV Curve
©On-Bright Electronics
Preliminary Datasheet

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