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CAT32ZD4-GT3 Datasheet(PDF) 6 Page - Catalyst Semiconductor |
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CAT32ZD4-GT3 Datasheet(HTML) 6 Page - Catalyst Semiconductor |
6 / 14 page CAT32 Doc. No. MD-5001 Rev. AD 6 © Catalyst Semiconductor, Inc. Characteristics subject to change without notice OPERATION The CAT32 device is a high efficiency, constant frequency, current regulating boost converter. The device includes a switch and an internally compensated loop for the regulation of the LED current. Operation can be best understood by examining the block diagram. The RSET pin is regulated at 100mV and the current through the external resistor will set the regulated current in the LEDs (from 5mA to 40mA) with a multiplication factor of 225. While maintaining LED current regulation, the CAT32 automatically adjusts the LED pin voltage to be as low as possible. A low LED pin voltage ensures high efficiency. Current through the internal power switch is continuously monitored cycle-by-cycle. If the current limit is exceeded, the switch is immediately turned off, protecting the device, for the remainder of the cycle. PWM dimming operation can be achieved by switching the SHDN ¯¯¯¯¯ pin or by pulling the RSET pin higher than 0.1V. BLOCK DIAGRAM Figure 2. CAT32 Block Diagram Current Sense Amp CAT32 ILED = 225 x IS ILED PWM & Logic Current Control 1.2MHz Oscillator IS 100mV RSET GND RSET SW LED Over Voltage Protection (22V) 225x VIN C1 D1 L1 C2 SHDN 6 3 4 2 1 5 VIN |
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