Products, Materials & Tools | Dec 17, 2009

Allegro LED Drivers Include MIC, Power MOSFET

The LC5205D and LC5210D off-line LED driver IC series include both a main controller integrated circuit (MIC) and a power MOSFET. The high-voltage capability allows direct connection to a wide range of supply voltages ranging from 25 to 400 V (recommended).

• Supply voltage, VBB, 450 V maximum, 25 to 400 V recommended; Note: lowest voltage can vary depending on LED loads
• Output current IO(max) options:
  - 0.5 A, LC5205D
  - 1.0 A, LC5210D
•Constant current control circuit:
  - Fixed off-time PWM constant current control, off-time adjustable by external components
  - Externally adjustable output current by input voltage to REF pin
• Output current dimming by external PWM signal; low signal to TOFF pin shuts off output current, and PWM signal input to that pin enables dimming
• Undervoltage lockout protection (UVLO)
• Overcurrent protection (OCP); latched in response to the short-to-GND condition
• Thermal Shutdown protection (TSD); protects IC from damage due to excess temperature, auto-restart when temperature drops below threshold
Output current for the LC5205D is 0.5 A and for the LC5210D, 1 A. Packaged in a standard 8-pin DIP, with pin 7 removed for greater creepage distance from the supply pin, the series also features overcurrent and thermal-shutdown protection. (ea/1,000, LC5205D, $0.95; LC5210D, $1 — 8 weeks ARO.)

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