HV9967BDB1 Microchip

Supertex inc. HV9967BDB1 4W LED Driver Demoboard with Accurate Average-Mode Constant Current Control General Description Specifications The HV9967BDB1 demoboard is a high-brightness LED Parameter Specification driver designed to drive 4 LEDs in series at currents up to Input voltage 20 - 60 VDC 350mA from a 20 - 60V DC input. The demoboard uses the Supertexs HV9967B in a buck configuration in a constant Output voltage 10 -15VDC (4 x LEDs) off-time mode. Output current 350mA 5% 20% pk-pk The HV9967BDB1 LED driver features tight regulation of the Output current ripple (Typical, depending on LED current within a few milliamps over the entire range of the type of LED) the input voltage (i.e. 20 - 60VDC). The LED current accuracy Variable with constant is almost insensitive to the passive component tolerances, Switching frequency T = 5s 20% such as the inductance or the timing resistor. OFF Full load efficiency Typical 80% minimum PWM dimming can be achieved by applying a pulse-width- Output short circuit protection Included, hiccup mode modulated square wave signal between the PWMD and GND pins. Connection Diagram V (+) LED V (-) LED V (+) V (-) IN IN VDD PWMD GND Connections 1. Connect the LED string between LED+ (Anode of 3. Connect the input DC voltage between the VIN+ LED string) and LED- (Cathode of LED string). and VIN- terminals. 2. Connect the PWMD terminal to the VDD terminal to enable the LED driver if PWM dimming is not re- quired. Doc. DSDB-HV9967BDB1 Supertex inc. B101613 www.supertex.comHV9967BDB1 Circuit Schematic J1 C4 C3 1 1.0F 1.0F J2 2 100V 100V W3 C2 D1 2 4.7F JX 89 B1100 1 25V R4 52k3 1% 6 TV L1 1 J3 8 UY XFF 330H R2 1k0 3 4 2 RYOF 2 TP1 1 TUGPUG 7 C1 CIPF R1 1.0F RIPF 0R68 16V 1/4W 3 TP2 Typical Characteristics UykejkpHtgswgpexKprwXqnvci*X 34X+ QwvrwEwttgpxKprwXqnvci*X 34X+ 0.38 200 0.36 150 0.34 100 0.32 0.3 50 20 30 40 50 60 20 30 40 50 60 KprwXqnvci*X+ KprwXqnvci*X+ GhhkekgpexKprwXqnvci*X 34X+ 90.0 88.0 86.0 20 30 40 50 60 KprwXqnvci*X+ Doc. DSDB-HV9967BDB1 Supertex inc. B101613 2 www.supertex.com UykvejkpHtgswgpe*mJ + Ghhkekgpe* + QwvrwEwttgp*C+