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UC3572DTRG4 数据表(PDF) 4 Page - Texas Instruments |
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UC3572DTRG4 数据表(HTML) 4 Page - Texas Instruments |
4 / 9 page 4 UC1572 UC2572 UC3572 4 8 7 1 2 6 5 3 R SLEEP1 56k R SLEEP2 33k R COMP R REF RV SENSE 40k RSLEEP3 1MEG R CS C IN 10 µF COUT 100 µF VOUT GND –12V OUT D FLYBACK L FLYBACK M SWITCH C RAMP 680pF CV CC 10 µF M SLEEP GND SLEEP VIN VCC 3VREF RAMP EAINV EAOUT GND CS OUT UC1572 C3V REF 100nF C COMP Figure 2. Typical application: +5V to –12V flyback converter. UDG-99057 PIN DESCRIPTIONS 3VREF: Precision 3V reference. Bypass with 100nF ca- pacitor to GND. CS: Current limit sense pin. Connect to a ground refer- enced current sense resistor in series with the flyback in- ductor. OUT will be held high (PMOS switch off) if CS exceeds 0.2V. EAINV: Inverting input to error amplifier. Summing junc- tion for 3VREF and VOUT sense. The non-inverting input of the error amplifier is internally connected to GND. This pin will source a maximum of 1mA. EAOUT: Output of error amplifier. Use EAOUT and EAINV for loop compensation components. GND: Circuit Ground. OUT: Gate drive for external PMOS switch connected between VCC and the flyback inductor. OUT drives the gate of the PMOS switch between VCC and GND. RAMP: Oscillator and ramp for pulse width modulator. Frequency is set by a capacitor to GND by the equation F kCRAMP = • 1 15 Recommended operating frequency range is 10kHz to 200kHz. VCC: Input voltage supply to chip. Range is 4.75 to 30V. Bypass with a 1 µF capacitor. |
类似零件编号 - UC3572DTRG4 |
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类似说明 - UC3572DTRG4 |
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