Datasheet LTC3863 (Analog Devices) - 5

LTC3863
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C, unless otherwise noted. Pulse-Skipping Mode Operation Burst Mode Operation Transient Response: Waveforms Waveforms Burst Mode Operation
VOUT VOUT ILOAD 50mV/DIV 50mV/DIV 1A/DIV V V SW SW VOUT 10V/DIV 10V/DIV 200mV/DIV I I I L L L 500mA/DIV 500mA/DIV 1A/DIV VIN = 12V 2µs/DIV 3863 G01 VIN = 12V 20µs/DIV 3863 G02 VIN = 12V 100µs/DIV 3863 G03 VOUT = –5V VOUT = –5V VOUT = –5V ILOAD = 100mA ILOAD = 100mA TRANSIENT = 100mA TO 1.6A FIGURE 7 CIRCUIT FIGURE 7 CIRCUIT FIGURE 7 CIRCUIT
Transient Response: Transient Response: Rising Edge Transient Response: Falling Edge Pulse-Skipping Mode Operation Pulse-Skipping Mode Operation Pulse-Skipping Mode Operation
ILOAD ILOAD ILOAD 1A/DIV 1A/DIV 1A/DIV VOUT VOUT 200mV/DIV 200mV/DIV VOUT 200mV/DIV IL IL IL 1A/DIV 1A/DIV 1A/DIV VIN = 12V 100µs/DIV 3863 G04 VIN = 12V 10µs/DIV 3863 G05 VIN = 12V 10µs/DIV 3863 G06 VOUT = –5V VOUT = –5V VOUT = –5V TRANSIENT = 100mA TO 1.6A TRANSIENT = 100mA TO 1.6A TRANSIENT = 1.6A TO 100mA FIGURE 7 CIRCUIT FIGURE 7 CIRCUIT FIGURE 7 CIRCUIT
Normal Soft-Start Soft-Start into a Prebiased Output Output Tracking
VOUT2 V RUN IN 2V/DIV 5V/DIV 5V/DIV VOUT1 VOUT1 2V/DIV 2V/DIV VOUT2 V 2V/DIV OUT2 TRACK/SS 2V/DIV 200mV/DIV TRACK/SS TRACK/SS V 200mV/DIV OUT1 200mV/DIV 2V/DIV VIN = 12V 1ms/DIV 3863 G07 VIN = 12V 1ms/DIV 3863 G08 VIN = 12V 20ms/DIV 3863 G09 VOUT1 = 5V VOUT1 = 5V, VOUT2 = –5V VOUT1 = 5V VOUT2 = –5V PRE-BIAS1 = 2V, PRE-BIAS2 = –2V VOUT2 = –5V ILOAD1 = ILOAD2 = 100mA ILOAD = 50mA ILOAD1 = ILOAD2 = 100mA FIGURE 11 CIRCUIT FIGURE 11 CIRCUIT FIGURE 11 CIRCUIT Rev. B For more information www.analog.com 5 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Functional Diagram Operation Applications Information Typical Applications Package Description Revision History Typical Application Related Parts