基于PS92010設計的高效PWM LED驅動方案

PS92010是TI 公司的高效PWM控制器，集成了頻率折返和低功耗工作模式，以降低輕負載和無負載時的工作頻率，從而提高LED驅動的效率．主要用在住宅區LED照明驅動以及各種LED照明．本文介紹了PS92010主要特性，方框圖，開路測試電路，典型應用電路以及離線LED照明驅動模塊TPS92010EVM-592主要特性和電路圖與材料清單．

The TPS92010 is a PWM controller with advanced energy features to provide high efficiency driving for LED lighting applications.

The TPS92010 incorporates frequency fold back and low power mode operation to reduce the operation frequency at light load and no load operations.

The TPS92010 is offered in the 8-pin SOIC (D) package. Operating junction temperature range is –40℃ to 105℃.

PS92010主要特性：

LED Lighting Current Driver Controller with Energy Saving Features

Quasi-Resonant Mode Operation for Reduced EMI and Low Switching Losses (Low Voltage Switching)

Low Standby Current for Deep Dimming Efficiency Power Consumption

Low Startup Current: 25 μA Maximum

Programmable Line and Load Overvoltage Protection

Provides Open LED Protection

Internal Overtemperature Protection

Current Limit Protection

Cycle-by-Cycle Power Limit

Primary-Side Overcurrent Hiccup Restart Mode

1-A Sink TrueDrive, –0.75-A Source Gate Drive Output

Programmable Soft-Start

PS92010應用：

Residential LED Lighting Drivers for A19 E12/E26/27, GU10, MR16, PAR30/38 Integral Lamps

Drivers for Wall Sconces, Pathway Lighting and Overhead Lighting

Drivers for Wall Washing, Architectural and Display Lighting


圖１．PS92010方框圖

圖２．PS92010開路測試電路

圖３．PS92010應用電路

圖４．PS92010 QR檢測詳細電路

離線LED照明驅動模塊TPS92010EVM-592

TPS92010 High Efficiency Offline LED Lighting Driver Controller Evaluation Module?

The TPS92010EVM-592 is a TRIAC dimmable LED driver. It can provide a 0.325-A constant current to four or five high-brightness LEDs. The EVM includes a five-LED load. It is powered from the mains which is rated at 100 Vrms to 130 Vrms. The output current can be modified for constant levels from 0.2 A to 0.7 A.

This EVM uses the TPS92010 high efficiency offline LED lighting driver controller. The power topology is a quasi resonant mode flyback. This makes for a cost competitive solution. This TPS92010 EVM implements a constant current, high efficiency, low ripple AC-DC LED lighting driver.

Current is sensed directly via a resistor and operational-amplifier. This in turn drives an opto-coupler which sets the PWM pulses via the TPS92010 to control the output current at a constant level.The design also incorporates a circuit to ensure compatibility with a large number of commonly available TRIAC based dimmers. This circuit monitors the line voltage for TRIAC operation. When the TRIAC is operating the line voltage is chopped. This information is used by the circuit to reduce the constant output current level thus dimming the LEDs. It also applies a current path at the input to ensure the TRIAC triggers correctly and maintains triggered condition.

離線LED照明驅動模TPS92010EVM-592塊主要特性：

? TRIAC compatible dimming

? Low-cost line powered LED driver solution

? Includes 5 HB-LEDs as a sample load

? Allows easy use of user own LED load

? Test points for LED voltage and current

? Accurate current sensing to maintain constant current to LEDs

? Modifiable output current from 0.2 A to 0.7 A, 0.325 A is default


圖５．TPS92010EVM-592 PSU (HPA594)電路圖

TPS92010EVM-592材料清單（BOM）：