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CAV4201TD-GT3 Datasheet(PDF) 7 Page - ON Semiconductor |
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CAV4201TD-GT3 Datasheet(HTML) 7 Page - ON Semiconductor |
7 / 12 page CAV4201 http://onsemi.com 7 Table 6. PIN DESCRIPTION Pin Name Function 1 CTRL Enable and analog dimming control input pin. 2 GND Ground reference. 3 RSET RSET pin. A resistor connected between the pin and ground sets the average LED current. 4 SW Interface to the inductor. 5 VBAT Supply voltage for the device. Pin Function VBAT is the supply input to the device. Typical current conduction into this pin is less than 1 mA and voltage transients of up to 40 V can be applied. To ensure accurate LED current regulation, the VBAT voltage should be 3 V higher than the total forward voltage of the LED string. A bypass capacitor of 4.7 mF or larger is recommended between VBAT and GND. CTRL is the enable and analog dimming control input. An internal pull−down current of 20 mA allows the LEDs to shutdown if CTRL is left floating. Voltages of up to 40 V can be safely handled by the CTRL input pin. When the CTRL voltage is less than 0.9 V (typ), the LEDs will shutdown to zero current. When the CTRL voltage is greater than about 2.6 V, the device is enabled and full scale brightness is applied to the LED output. At voltages of less than around 2.6 V, the LED current is progressively dimmed until shutdown. For lamp replacement applications, or applications where operation in dropout mode is expected, it is recommended that the CTRL pin voltage be derived from the LED cathode terminal. GND is the ground reference pin. This pin should be connected directly to the ground plane on the PCB. SW pin is the drain terminal of the internal low resistance high−voltage power MOSFET. The inductor and the Schottky diode anode should be connected to the SW pin. Voltages of up to 40 V can be safely handled on the SW pin. Traces going to the SW pin should be as short as possible with minimum loop area. The device can handle safely “open−LED” or “shorted−LED” fault conditions. RSET pin is regulated at 1.2 V. A resistor connected between the RSET pin and ground sets the LED full−scale brightness current. The external resistance value and the CTRL pin voltage determine the LED current during analog dimming. The RSET pin must not be left floating. The highest recommended resistor value between RSET and ground is 90 k W. |
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