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SP6123 Datasheet(PDF) 15 Page - Sipex Corporation |
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SP6123 Datasheet(HTML) 15 Page - Sipex Corporation |
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15 / 18 page  15 Date: 5/25/04 SP6123 Low Voltage, Synchronous Step Down PWM Controller © Copyright 2004 Sipex Corporation Figure 5. A voltage divider connected to the VFB pin programs the output voltage. ® ® VFB VOUT SP6123 R1 R2 Overcurrent Protection Over current protection on the SP6123 is imple- mented through detection of an excess voltage condition across the high side switch during conduction. This is typically referred to as high side RDS(ON) detection. By using the RDS(ON) of Q1 to measure the output current, the current limit circuit eliminates the sense resistor that would otherwise be required and the corre- sponding loss associated with it. This improves the overall efficiency and reduces the number of components in the power path benefiting size and cost. RDS(ON) sensing is by default inaccu- rate and is primarily meant to protect the power supply during a fault condition. The overcurrent trip point will vary from unit to unit as the RDS(ON) of MOSFET varies. The SP6123 pro- vides a built-in 200mV threshold between the VCC and SWN pins. The overcurrent threshold can be calculated as IMAX = 200mV RDS(ON) To ensure accurate current sensing, the VCC pin should be connected directly to the drain of the high side MOSFET. A RC filter on the VCC pin is not recommended because it would artifi- cially alter the current signal and reduce the overcurrent threshold from the value given by the equation. Output Voltage Program As shown in Figure 5, the voltage divider con- necting to the VFB pin programs the output voltage according to VOUT = 0.8(1 + R1 ) R2 where 0.8V is the internal reference voltage. Select R2 in the range of 10k to 100k, and R1 can be calculated using R1 = R2(VOUT – 0.8) 0.8 APPLICATIONS INFORMATION |
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