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RT9203GS Datasheet(PDF) 11 Page - Richtek Technology Corporation |
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RT9203GS Datasheet(HTML) 11 Page - Richtek Technology Corporation |
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11 / 16 page  RT9203/A Preliminary 11 DS9203/A-10 March 2007 www.richtek.com Application Information The RT9203/A operates at either single 5V power supply with a bootstrap UGATE driver or a 5V/12V dual-power supply form the ATX SMPS. The dual- power supply is recommended for high current applications, the RT9203/ A can deliver higher gate driving current while operating with ATX SMPS based on a dual-power supply. The Bootstrap Operation In a single power supply system, the UGATE driver of RT9203/A is powered by an external bootstrap circuit, as shown in the Figure 3. The boot capacitor, CBOOT, generates a floating reference at the PHASE pin. Typically a 0.1 µF CBOOT is enough for most of MOSFETs used with the RT9203/A. The voltage drop between BOOT and PHASE is refreshed to a voltage of VCC - diode drop (VD) while the lower MOSFET turning on. Figure 3. Single 5V power Supply Operation Dual Power Operation The RT9203/A was designed to supply a regulated 6.0V at VCC pin automatically when BOOT pin is powered by a 12V. In a system with ATX 5V/12V power supply, the RT9203/A is ideal for higher current applications due to the higher gate driving capability, VUGATE = 12V and VLGATE = 6.0V. A RC (10 Ω/1µF) filter is also recommended at BOOT pin to prevent the ringing induced from fast power- on, as shown in Figure 4. Figure 4. Dual Power Supply Operation Power On Reset The Power-On Reset (POR) monitors the supply voltage (normal +5V) at the VCC pin and the input voltage at the OCSET pin. The VCC POR level is set to 4.1V with 0.5V hysteresis and the normal level at OCSET pin is set to 1.5V (see over-current protection). The POR function initiates soft-start operation after all supply voltages exceed their POR thresholds. Soft Start A built-in soft-start is used to prevent surge current from power supply input during powering on. The soft-start voltage is controlled by an internal digital counter. It slows down and clamps the ramping of reference voltage at the input of error amplifier and the pulse-width of the output driver. The typical soft-start duration is 2.5ms. Under Voltage and Over Voltage Protection The voltage presents at FB pin is monitored and protected against OC (over current), UV (under voltage), and OV (over voltage). The UV threshold is 0.5V and OV threshold is 1.0V. Both UV and OV detection are with 30ms delay after triggered. When OC or UV trigged, a hiccup re-start sequence will be initialized, as shown in Figure 5. For RT9203, Only 3 times of trigger are allowed before latching off. But for RT9203A, UVP will be kept in hiccup mode. Hiccup is disabled during soft-start interval. 5V VCC LGATE PHASE UGATE BOOT R1 VCC C2 1uF RT9203/A 0.1uF D1 5V VCC LGATE UGATE BOOT R C2 1uF RT9203/A 1uF 6.0V Regulation 10 C 12V VCC |
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