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CAT37EKK-TE7 Datasheet(PDF) 6 Page - Catalyst Semiconductor |
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CAT37EKK-TE7 Datasheet(HTML) 6 Page - Catalyst Semiconductor |
6 / 13 page CAT37 6 Doc. No. 5005, Rev. R OPERATION The CAT37 device is a high efficiency, constant frequency, current regulating boost driver for white LEDs. The device includes a switch and an internally compensated loop for the regulation of the current in the LEDs. Operation can be best understood by examining the block diagram. The FB pin is regulated at 95 mV and the current through the external resistor will set the regulated current in the LEDs at: ILED = 0.095/R1 While maintaining LED current regulation, the CAT37 boost converter automatically adjusts the FB pin voltage to be as low as possible. A low FB 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 FB pin higher than 95mV. BLOCK DIAGRAM Figure 2. CAT37 Block Diagram VIN 1.2 MHz Clock PWM & Logic D1 L1 VIN C1 2 FB Current Sense Amp SW 1 5 CAT37 3 Error Amp C2 4 SHDN GND 0.095V REF ILED R1 + - Over Voltage Protection (22V) Note: SOT23 Pin Numbers |
Similar Part No. - CAT37EKK-TE7 |
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Similar Description - CAT37EKK-TE7 |
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