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LB2016B4R7 데이터시트(PDF) 6 Page - ON Semiconductor |
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LB2016B4R7 데이터시트(HTML) 6 Page - ON Semiconductor |
6 / 11 page CAT32 http://onsemi.com 6 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 100 mV and the current through the external resistor will set the regulated current in the LEDs (from 5 mA to 40 mA) 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 0.1 V. Block Diagram Figure 14. CAT32 Block Diagram Current Sense Amp CAT32 PWM & Logic Current Control 1.2 MHz Oscillator 100 mV GND RSET SW LED Over Voltage Protection (22 V) 225x C1 6 3 4 2 1 5 VIN VIN SHDN C2 D1 + − + − ILED = 225 x IS L1 RSET IS ILED |
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