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| LTC3863_15 Datasheet, PDF (5/38 Pages) Linear Technology – 60V Low IQ Inverting DC/DC Controller | |||
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LTC3863
Typical Performance Characteristics TA = 25°C, unless otherwise noted.
Pulse-Skipping Mode Operation
Waveforms
Burst Mode Operation
Waveforms
VOUT
50mV/DIV
VOUT
50mV/DIV
VSW
10V/DIV
IL
500mA/DIV
VIN = 12V
2µs/DIV
VOUT = â5V
ILOAD = 100mA
FIGURE 7 CIRCUIT
VSW
10V/DIV
IL
500mA/DIV
3863 G01
VIN = 12V
20µs/DIV
VOUT = â5V
ILOAD = 100mA
FIGURE 7 CIRCUIT
Transient Response:
Burst Mode Operation
ILOAD
1A/DIV
VOUT
200mV/DIV
IL
1A/DIV
3863 G02
VIN = 12V
100µs/DIV
VOUT = â5V
TRANSIENT = 100mA TO 1.6A
FIGURE 7 CIRCUIT
3863 G03
Transient Response:
Pulse-Skipping Mode Operation
Transient Response: Rising Edge
Pulse-Skipping Mode Operation
Transient Response: Falling Edge
Pulse-Skipping Mode Operation
ILOAD
1A/DIV
ILOAD
1A/DIV
ILOAD
1A/DIV
VOUT
200mV/DIV
IL
1A/DIV
VOUT
200mV/DIV
IL
1A/DIV
VOUT
200mV/DIV
IL
1A/DIV
VIN = 12V
100µs/DIV
VOUT = â5V
TRANSIENT = 100mA TO 1.6A
FIGURE 7 CIRCUIT
3863 G04
VIN = 12V
10µs/DIV
VOUT = â5V
TRANSIENT = 100mA TO 1.6A
FIGURE 7 CIRCUIT
3863 G05
VIN = 12V
10µs/DIV
VOUT = â5V
TRANSIENT = 1.6A TO 100mA
FIGURE 7 CIRCUIT
3863 G06
Normal Soft-Start
VIN
5V/DIV
VOUT1
2V/DIV
VOUT2
2V/DIV
TRACK/SS
200mV/DIV
VIN = 12V
1ms/DIV
VOUT1 = 5V
VOUT2 = â5V
ILOAD1 = ILOAD2 = 100mA
FIGURE 11 CIRCUIT
Soft-Start into a Prebiased Output
RUN
5V/DIV
VOUT1
2V/DIV
Output Tracking
VOUT2
2V/DIV
3863 G07
VOUT2
2V/DIV
TRACK/SS
200mV/DIV
VIN = 12V
1ms/DIV
VOUT1 = 5V, VOUT2 = â5V
PRE-BIAS1 = 2V, PRE-BIAS2 = â2V
ILOAD = 50mA
FIGURE 11 CIRCUIT
3863 G08
TRACK/SS
200mV/DIV
VOUT1
2V/DIV
VIN = 12V
20ms/DIV
VOUT1 = 5V
VOUT2 = â5V
ILOAD1 = ILOAD2 = 100mA
FIGURE 11 CIRCUIT
3863 G09
For more information www.linear.com/3863
3863fa
5
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