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LTC1628 Datasheet(PDF) 7 Page - Linear Technology |
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LTC1628 Datasheet(HTML) 7 Page - Linear Technology |
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7 / 32 page  7 LTC1735 1735fc PI FU CTIO S VOUT(RIPPLE) (Burst Mode Operation) Load Step (Burst Mode Operation) Load Step (Continuous Mode) VOUT 50mV/DIV IL 5A/DIV 0A TO 10 µs/DIV 9A LOAD STEP FCB = 0V VIN = 15V VOUT = 1.6V VOUT 50mV/DIV IL 5A/DIV VOUT 20mV/DIV IL 5A/DIV FCB = 5V 5 µs/DIV VIN = 15V VOUT = 1.6V 10mA TO 10 µs/DIV 9A LOAD STEP FCB = 5V VIN = 15V VOUT = 1.6V 1735 G27 1735 G26 1735 G25 FIGURE 1 FIGURE 1 FIGURE 1 ILOAD = 1.5A TYPICAL PERFOR A CE CHARACTERISTICS Start-Up VOUT 1V/DIV VRUN/SS 5V/DIV IL 5A/DIV VIN = 15V 5ms/DIV VOUT = 1.6V RLOAD = 0.16Ω VOUT(RIPPLE) (Synchronized) VOUT 10mV/DIV IL 5A/DIV EXT SYNC f = fO 10 µs/DIV VIN = 15V VOUT = 1.6V VOUT 20mV/DIV IL 5A/DIV VOUT(RIPPLE) (Burst Mode Operation) FCB = 5V 50 µs/DIV VIN = 15V VOUT = 1.6V 1735 G22 1735 G23 1735 G24 FIGURE 1 FIGURE 1 ILOAD = 10mA ILOAD = 50mA COSC: External capacitor COSC from this pin to ground sets the operating frequency. RUN/SS: Combination of Soft-Start and Run Control In- puts. A capacitor to ground at this pin sets the ramp time to full output current. The time is approximately 1.25s/ µF. Forcing this pin below 1.5V causes the device to shut down. (See Applications Information section for quiescent current note.) In shutdown all functions, including INTVCC, are disabled. Latchoff overcurrent protection is also in- voked via this pin as described in the Applications Infor- mation section. ITH: Error Amplifier Compensation Point. The current comparator threshold increases with this control voltage. Nominal voltage range for this pin is 0V to 2.4V. FCB: Forced Continuous/Synchronization Input. Tie this pin to ground for continuous synchronous operation, to a resistive divider from the secondary output when using a secondary winding or to INTVCC to enable Burst Mode operation at low load currents. Clocking this pin with a signal above 1.5VP–P disables Burst Mode operation but allows cycle-skipping at low load currents and synchro- nizes the internal oscillator with the external clock. The FCB pin must not be driven when the device is shut down (RUN/SS pin low). SGND: Small-Signal Ground. All small-signal components such as COSC, CSS, the feedback divider plus the loop com- pensation resistor and capacitor(s) should single-point tie to this pin. This pin should, in turn, connect to PGND. |
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Similar Description - LTC1628 |
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