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CAT4201 Datasheet(PDF) 8 Page - ON Semiconductor |
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CAT4201 Datasheet(HTML) 8 Page - ON Semiconductor |
8 / 12 page CAT4201 www.onsemi.com 8 Simplified Block Diagram Figure 22. CAT4201 Simplified Block Diagram 1.2 V Reference + – ON−Time Control OFF−Time Control 1.2 V 1 W 7 V 30 k W 20 mA EN SW GND RSET CTRL VBAT 12 V/24 V PWM Controller EN R2 Basic Operation The CAT4201 is a high efficiency step−down regulator designed to drive series connected high−power LEDs. LED strings with total forward voltages of up to 32 V can be driven with bias currents of up to 350 mA. During the first switching phase, an integrated high voltage power MOSFET allows the inductor current to charge linearly until the peak maximum level is reached, at which point the MOSFET is switched off and the second phase commences, allowing the inductor current to then flow through the Schottky diode circuit and discharge linearly back to zero current. The switching architecture ensures the device will always operate at the cross−over point between Continuous Conduction Mode (CCM) and Discontinuous Conduction Mode (DCM). This operating mode results in an average LED current which is equal to half of the peak switching current. LED Pin Current The LED current is set by the external RSET resistor connected to the regulated output of the RSET pin. An overall current gain ratio of approximately 2.5 A/mA exists between the average LED current and the RSET current, hence the following equation can be used to calculate the LED current. LED Current (A) ^ 2.5 V RSET (V) R SET (kW) Table 7 lists the various LED currents and the associated RSET resistors. Table 7. RSET RESISTOR SELECTION LED Current (A) RSET (k W) 0.10 33 0.15 21 0.20 15 0.25 12 0.30 10 0.35 8.25 |
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