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MC33567D-3 bảng dữ liệu(PDF) 4 Page - ON Semiconductor |
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4 / 12 page MC33567 http://onsemi.com 4 OPERATING DESCRIPTION Introduction The MC33567 series is a family of Dual Linear FET Controllers designed for Power Management applications where high current, voltage regulation is needed. Some computer applications include: • 1.2 V − Power Supply • 1.515 V − AGP (Advanced Graphic Port) and GTL+ (Gunning Transistor Logic − Intel’s electrical bus technology) • 1.818 V − I/O planes on motherboards • 2.3 V − Power Supply • 2.525 V − Clock and memory The MC33567 provides tight output voltage regulation, (Vout), and incorporates individual SHDN controls for each FET controller and voltage protection by sensing the output voltage. Output: The MC33567 provides tight output voltage regulation from one or two supply voltages using 2 external N−Channel MOSFETs. Each controller operates independently and regulates the output voltage to a predetermined level (1.2 V, 1.515 V 1.818 V, 2.3 V or 2.525 V). In addition, regulator 2 of the MC33567−1 incorporates a Vin bypass mode on which the external FET is fully enhanced. Shutdown: The regulated outputs of the MC33567 can be disabled with the use of the SHDN pin. It also determines the output voltage level. SHDN can be controlled externally from board signals like the AGP or GTL+ as shown in Figure 3. Figure 3. 1.5 V/3.3 V AGP Card Detection *Vin while on bypass mode (MC33567−1 only) 1 2 3 4 8 7 6 5 MC33567 DRV2 SENSE2 3.3 V AGP Card Type Detection AGP Card Voltage Vout or Vin* 12 V (VCC) 3.3 V (Vin) SHDN2 10 k W Listed below are the SHDN threshold voltage levels and the corresponding regulator output voltages: 1. If the SHDN pin is left open, the output voltage is set to its regulated value. 2. If a voltage less than 0.8 V is applied to the SHDN pin, the output voltage is set to 0 V. 3. If a voltage greater than 1.3 V and less than 4.1 V is applied to the SHDN pin, the output voltage is set to its regulated voltage. 4. If the SHDN voltage is pulled above 4.1 V, the MC33567 enters a Vin bypass mode. In this mode, the MOSFET is fully enhanced and the output voltage is the MOSFET drain voltage (Vin) minus the MOSFET drain−source on voltage VDS(on). This feature is only available on REGULATOR 2 of the MC33567−1. Table 1 summarizes the output voltage options and its relationship with VSHDN. Table 1. Logic Table for SHDN Pin Device V SHDN (V) Vout (V) MC33567−1 REGULATOR 1 No Connect t0.8 V u1.3 V 1.818 V 0 V 1.818 V REGULATOR 2 No Connect t0.8 V 1.3 V t VSHDN t 4.1 V u 4.1 V 1.515 V 0 V 1.515 V Vin−VDS(on) (Bypass Mode) MC33567−2 REGULATOR 1 & REGULATOR 2 No Connect t0.8 V u1.3 V 2.525 V 0 V 2.525 V MC33567−3 REGULATOR 1 No Connect t0.8 V u1.3 V 2.3 V 0 V 2.3 V REGULATOR 2 No Connect t0.8 V u 1.3 V 1.2 V 0 V 1.2 V Undervoltage Detection: If Vout drops below 75% of the regulated threshold for greater than 250 µs or a short circuit condition is present, that output will go into short circuit or Hiccup Mode. While in Hiccup mode, the output is turned ON for 1.0 ms and OFF for 40 ms for a duty cycle of 1:41 as shown in Figure 4. This mode will continue as long as the fault is present. Once the fault is removed, the regulator will resume normal operation. 40 ms 1 ms Figure 4. Hiccup Mode Duty Cycle |
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