© janaka dharmasena dreamstime.com_technical Application Notes | June 24, 2015
Low-cost LED driver module 0.5 A / 33 VDC with >90% efficiency for general use
This article describes simple constant current driver module with fast PWM input that can be used for driving middle and high power LEDs.
The module uses Taiwan Semiconductor TSC19376 LED driver, operates from 8 to 33 VDC and the output current can be configured from 0.1 to 0.5 A in several steps. This article outlines component selection in order to implement this solution into a design.
Fig. 1. LED driver schematic ----- Fig. 2. Current and voltage waveform at switching node (GND oscilloscope connected to Vcc) ----- Fig. 3. LED Driver module connection diagram -----Specification:
- Topology: Buck
- Regulation: Hysteretic
- Input voltage: 8-33 VDC
- Output current: 100-500 mA
- Switching frequency: 1 MHz max
- Current ratio: 0.13 Ω / 1 A
- Dimensions: 16 x 16 x 5.5 mm (0.63 x 0.63 x 0.22 in)
- Weight: 1.6 g
- Thermal shutdown
- Over Current protection
- Dimming: PWM up to 20 kHz
Fig. 4. LED driver characteristics measured at different conditions. ----- BOMThe TS19376 includes over temperature shutdown protection. Once the die temperature reaches 150°C the driver is disabled until the temperature drops below 115°C. This protection is useful to prevent burning of the module PCB. The driver module can be attached to an external heat sink with double-sided thermo-conductive tape (e.g. Bergquist Bond Ply). It is also possible to extend the driver module with EMI filtering, and reverse polarity protection (e.g. P-MOS switch), but this depends on the specific application. The driver module is populated on a 16x16 mm double-sided, 1 mm thick FR4 PCB. Conclusion The described LED driver has numerous applications from driving middle and high power LED arrays, to battery charging and much more where a constant current source is required. The number of LEDs in a serial string is determined from the minimum allowed input voltage (Vcc). As can be seen from the charts in Fig. 4, the closer VLED is to Vcc the higher the efficiency. For example for Vcc=12V, 3xLED in series is a good choice (VLEDF~3V). All measurements in Fig. 4 were acquired on automated measurement setup at room temperature. ----- Author: Valentin Kulikov, © FuturoLighting
- IO1 - TS19376CY5 Taiwan semi
- C1 - 4u7/50V (X7R, SMD 1210)
- C2 - 1uF/50V (X7R, SMD1206)
- D1 - SS16, Taiwan semi
- L1 - 100 µH, 800 mA, 433 m Ω 74404064101 Würth
- R1 - 0.39 Ω (SMD 0805)
- PCB FuturoLighting 376, Rev.O
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