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| HV9910DB6 Supertex Driver Evaluation Board for OSRAM OSTARTM LED General Description The Supertex HV9910DB6 is a simple, constant-current, LED driver evaluation board designed to drive OSRAM's 6-chip or 4-chip OSTARTM from a 24V supply. The board uses the Supertex HV9910B in a buck configuration in a constant off-time mode. The peak current control scheme enables fairly accurate control of the LED current with a very simple control scheme and a low part count. The information in this datasheet also applies to the demoboards which have the Supertex HV9910. Specifications Parameter Input voltage LED string voltage Output current Switching frequency Efficiency@ 24V input Open LED protection Output short circuit protection Board dimensions Value 24V 10% 12 - 20V 700mA 10% for 6-chip OSTAR 750mA 10% for 4-chip OSTAR Variable 94% for 6-chip OSTAR 91% for 4-chip OSTAR Yes No 42mm x 16mm Connection Diagram 24V + - Connections 1.Connect the input voltage source between VIN and GND as shown. 2.Connect the LED load between VO+ and VO- as shown (anode to VO+ and cathode to VO-). Operation of the LED Driver The Supertex HV9910B LED Driver is a constant off-time, peak current-controlled buck converter. Constant off-time mode of operation is necessary to ensure stability of the peak current mode control since the duty cycle of operation is greater than 50%. The constant off-time operation gives a very good line regulation, making the LED current almost independent of the input voltage. However, constant off-time operation increases the variation of the LED current with the LED string voltage, since the inductor current ripple is highly dependent on the load voltage. This is typically not a problem since the LED voltage variation for a given load is fairly small. HV9910DB6 Typical Results Full Load Efficiency vs. Input Voltage 95 Efficiency (%) 94 93 92 21 22 23 24 Input Voltage (V) 25 26 27 Fig. 1. Full Load Efficiency Plot Fig. 1 shows the full load efficiency of the LED driver over the input voltage range of the driver. Line Regulation of LED Current 1 % change in current 0.5 0 -0.5 -1 21 22 23 24 Input Voltage (V) 25 26 27 Fig. 2. Line Regulation of Output Current Fig. 2 shows the line regulation of the driver over the input voltage range. 2 HV9910DB6 Typical Results Load Regulation of LED Current (@VIN = 24V) 0.76 0.75 LED Current (A) 0.74 0.73 0.72 0.71 0.7 10 12 14 16 18 20 Output Voltage (V) Fig. 3. Load Regulation of Output Current Fig. 3 shows the variation of the output current with output voltage. Switching Frequency vs. Input Voltage (@VO = 19V) 120 100 80 60 40 20 0 21 22 23 24 Input Voltage (V) Switching Frequency (kHz) 25 26 27 Fig. 4a. Switching Frequency Variation with Input Voltage Fig. 4a shows the variation of the switching frequency over the entire input voltage range. 3 HV9910DB6 Typical Results Switching Frequency vs. Load Voltage (@VIN = 24V) 200 Switching Frequency (kHz) 160 120 80 40 0 12 14 16 Output Voltage (V) 18 20 Fig. 4b. Switching Frequency Variation with Output Voltage Fig. 4b shows the variation of the switching frequency with the load voltage. Drain Voltage Drain Voltage LED Current LED Current Fig. 5a. Steady State Waveforms for a 6- chip OSTAR Fig. 5b. Steady State Waveforms for a 4- chip OSTAR Fig. 5 shows the steady state waveforms of the LED driver driving the OSTAR loads. 4 HV9910DB6 Schematic VIN VO+ C4 2.2F 50V C4 2.2F 50V D1 B240A-13-F 1 C2 0.22F, 50V GND 0 6 7 5 U1 VDD LD GND RT GATE CS 8 4 2 R2 43.2k 1 2 VO- VIN HV9910B L1 150H Q1 VNN1NV04 PWMD C1 2.2F, 10V R1 0.56 R3 0.68 3 0 0 0 0 Bill of Materials Item # 1 2 3 4 5 6 7 8 9 10 Qty 1 1 2 1 1 1 1 1 1 1 Ref C1 C2 C3, C4 D1 L1 Q1 R1 R2 R3 U1 Description 2.2F, 16V, X7R ceramic chip capacitor 0.22F, 50V, X7R ceramic chip capacitor 2.2F, 50V, X7R ceramic chip capacitor 40V, 2.0A schottky diode 150H, 1.05A rms, 1.15A sat inductor 40V, 1.7A N-channel FET 0.56, 1/8W, 1% chip resistor 43.2k, 1/8W, 1% chip resistor 0.68, 1/8W, 1% chip resistor Universal LED Driver Package SMD0805 SMD0805 SMD1206 SMA SMT SOT223 SMD0805 SMD0805 SMD0805 SO-8 Manufacturer Manufacturer's Part Number Kemet Murata Murata Diodes Inc Cooper Electronics ST Micro Panasonic Yageo Panasonic Supertex C0805C225K4RACTU GRM21BR71H224MA01L GRM31CR71H225KA88L B240A-13-F CD1-151 VNN1NV0413TR ERJ-6RQFR56V RC0805FR-0743K2L ERJ-6RQFR68V HV9910BLG-G 081507 5 |
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