ZD832 TransformerFree™ AC-DC LED Driver Zywyn ZD832 Universal TransformerFree™ AC-DC Constant Current LED Driver Features General Description • AC to DC Constant Current Driver • No Transformer, No External Bridge Rectifier • Universal Input Voltage Range of 85VAC to 125VAC or 180VAC to 240VAC • Programmable up to 30mA Constant Output Current • PWM or Analog Dimming Control • Over-Temperature Protection • Over-Voltage Limiting on Internal Power Transistor • High Voltage Static Circuit Design With No EMI • Thermally Enhanced 20-Lead Exposed TSSOP Green Package The ZD832 is a high voltage, TransformerFree™ AC-DC constant current driver for driving a string of white or RGB LEDs in series. It operates from an universal input voltage of 85VAC to 125VAC, or 180VAC to 240VAC and generates a programmable constant output current. The high operating voltage of ZD832, along with its linear control architecture eliminates the need for an external inductor, transformer and rectifying diode bridge. The output current level is set by a single resistor and can be set as high as 30mA. Dimming control can be accomplished by using pulse-width modulation signal with varying duty cycle on the PWM pin or by applying an analog DC voltage on the ISET pin. Thermal and overvoltage circuitry protects the internal power transistors from excessive power dissipation. Applications • • • • • The ZD832 is available in a thermally enhanced 20-pin exposed TSSOP green package. Offline LED Lamps and Fixtures LCD Panel Display Backlighting Avionics Displays Decorative Lighting Industrial Lighting Ordering Information Part Number Pin Configuration Temperature Range ZD832LEY –40°C to +85°C ZD832EVB n/a Package Type 20-EP TSSOP Evaluation Board Please contact the factory for pricing and availability on Tape-on-Reel option. VAC- 1 20 VAC+ VAC- 2 19 NC NC 3 18 NC NC 4 17 NC NC 5 PWM 6 VCAP 7 ZD832 Typical Application 16 HVCC 15 VSEL 14 VOUT ISET 8 13 VOUT GND 9 12 PGND SGND 10 11 PGND + 100~240VAC 85 *VSEL - COUT 10μF VCAP CVCAP 1μF V ILED ZD832 20-Pin Exposed TSSOP VOUT REXT WARNING! This is a high voltage application circuit where Galvanic Isolation is not provided. Dangerous voltages are present when connected to the AC line. It is the responsibility of the engineer employing the ZD832 to ensure adequate safeguards are put in place to protect the end user from electrical hazardous shock. GND [ILED]=[2200/(RSET)] *For VAC = 85VAC ~ 125VAC, VSEL = HVCC For VAC = 180VAC ~ 240VAC, VSEL = OPEN Figure 1. ZD832 driving a string of LEDs in series at a presetted constant current Zywyn Specifications subject to change without notice 1 • Email [email protected] • www.zywyn.com Zywyn Corporation • Tel (408) 733-3225 • Fax (408) 733-3206 June 2010 rev. 1.8