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LC5200 Datasheet(PDF) 5 Page - Allegro MicroSystems |
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LC5200 Datasheet(HTML) 5 Page - Allegro MicroSystems |
5 / 15 page 5 Allegro MicroSystems, Inc. 115 Northeast Cutoff Worcester, Massachusetts 01615-0036 U.S.A. 1.508.853.5000; www.allegromicro.com 48102.002 LED Drivers LC5200 Series Application Information Typical Application Example A typical application circuit is shown in figure 1. The values of the external components are shown in the adjacent table. Component Value Setting LED LED current should not exceed the LC5200 device current ratings. Set the total voltage drop across the LED string to be less than VBB; otherwise, the LED string turns off. As a general design rule, the PWM off-time should be longer if there is a small drop in voltage across the LED string, and it should be shorter if there is a high drop in voltage across the LED string. For the LC5205D, a 9 to 30 V drop across the LED string is recom- mended for proper operation. LC5200 VBB OUT Sen GND Reg Toff Ref R1 R2 ROff COff C1 RS LED Di CO L Line Filter Input Referenced Typical Application Components Symbol Components Values / Ratings Descriptions C0 Electrolytic capacitor ≈100 μF / 450 V Main supply source voltage rectifying capacitor Note: ≤ 1 μF can be used C1 Capacitor 0.1 μF / 25 V The internal regulator output capacitor COff Capacitor 100 pF / 25 V PWM off-time adjusting capacitor Di Diode RL3A High voltage, ultrafast rectifying, current recirculation diode L Coil 1 mH / 1 A PWMing choke coil LED LEDs ――― LED load R1 Resistor 680 kΩ / 1/8 W Reference pin voltage setup resistor R2 Resistor 20 kΩ / 1/8 W Reference pin voltage setup resistor ROff Resistor 620 kΩ / 1/8 W PWM off-time adjusting resistor RS Resistor 1.0 Ω / 1 W Output current sensing resistor Figure 1. Typical application circuit |
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