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LT1534-1 Datasheet(PDF) 6 Page - Linear Technology |
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LT1534-1 Datasheet(HTML) 6 Page - Linear Technology |
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6 / 16 page  6 LT1534/LT1534-1 PIN FUNCTIONS referred to this ground. Keep the connection to the feed- back divider and VC compensation network free of large ground currents. VC (Pin 10/Pin 11): The compensation pin is used for frequency compensation and current limiting. It is the output of the error amplifier and the input of the current comparator. Loop frequency compensation can be per- formed with an RC network connected from the VC pin to ground. SHDN (Pin 11/Pin 12): The shutdown pin is used for disabling the switcher. Grounding this pin will disable all internal circuitry. Normally this output can be tied high (to VIN) or may be left floating. RCSL (Pin 12/Pin 13): A resistor to ground sets the current slew rate for the power switch. The minimum resistor value is 3.9k and the maximum value is 68k. Current slew will be approximately: ISLEW(A/µs) = 33/RCSL(kΩ) RVSL (Pin 13/Pin 14): A resistor to ground sets the voltage slew rate for the power switch collector. The minimum resistor value is 3.9k and the maximum value is 68k. Voltage slew will be approximately: VSLEW(V/µs) = 220/RVSL(kΩ) VIN (Pin 14/Pin 15): Input Supply Pin. Bypass this pin with a ≥ 4.7µF low ESR capacitor. When VIN is below 2.55V the part will go into undervoltage lockout where it will stop output switching and pull the VC pin low. PGND (Pin 16/Pin 3): Power Switch Ground. This ground comes from the emitters of the power switches. In normal operation this pin should have approximately 25nH induc- tance to ground. This can be done by trace inductance (approximately 1") or with wire or a specific inductive component (e.g., small ferrite bead). This inductance ensures stability in the current slew control loop during turn-off. Too much inductance (>50nH) may produce oscillation on the output voltage slew edges. COL (Pins 2, 15/Pin 2): These two pins should be con- nected together externally to create the collector of the power switch. The emitter returns to PGND through a sense resistor. Large currents flow into these pins so it is desirable to keep external trace lengths short to minimize radiation. SYNC (Pin 4): The SYNC pin can be used to synchronize the oscillator to an external clock (see Oscillator Sync in Applications Information section for more details). The SYNC pin may either be floated or tied to ground if not used. CT (Pin 5): The oscillator capacitor pin is used in conjunction with RT to set the oscillator frequency. For RT = 16.9k, CT(NF) = 129/fOSC(kHz) RT (Pin 6): The oscillator resistor pin is used to set the charge and discharge currents of the oscillator capacitor. The nominal value is 16.9k. It is possible to adjust this resistance ±25% to get a more accurate oscillator fre- quency. FB (Pin 7): The feedback pin is used for positive voltage sensing and oscillator frequency shifting during start-up and short-circuit conditions. It is the inverting input to the error amplifier. The noninverting input of this amplifier connects internally to a 1.25V reference. This pin should be left open if not used. NFB (Pin 8/Pin 10): The negative voltage feedback pin is used for sensing a negative output voltage. The pin is connected to the inverting input of the negative feedback amplifier through a 100k source resistor. The negative feedback amplifier provides a gain of – 0.5 to the feedback amplifier; therefore, the nominal regulation point is – 2.5V on NFB. This pin should be left open if not used. GND (Pin 9/Pins 1, 8, 9, 16): Signal Ground. The internal error amplifier, negative feedback amplifier, oscillator, slew control circuitry and the bandgap reference are (LT1534/LT1534-1) |
Similar Part No. - LT1534-1_15 |
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Similar Description - LT1534-1_15 |
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