LTC3788-1(RevA) 查看數據表（PDF） - Linear Technology
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LTC3788-1 Datasheet PDF : 30 Pages
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LTC3788-1
TYPICAL PERFORMANCE CHARACTERISTICS
SENSE Pin Input Current
vs Temperature
260
240 VSENSE = 12V
220
SENSE+ PIN
200
180
160
140
120
100
80
60
40
20
0
–45 –20
SENSE – PIN
5 30 55 80
TEMPERATURE (°C)
105 130
37881 G22
SENSE Pin Input Current
vs ITH Voltage
260
240 VSENSE = 12V
220
200
SENSE+ PIN
180
160
140
120
100
80
60
40
20
SENSE – PIN
0
0 0.5 1 1.5 2
ITH VOLTAGE (V)
2.5 3
37881 G23
SENSE Pin Input Current
vs VSENSE Voltage
260
240
220
SENSE+ PIN
200
180
160
140
120
100
80
60
40
20
SENSE – PIN
0
2.5 7.5 12.5 17.5 22.5 27.5 32.5 37.5
VSENSE
COMMON
MODE
VOLTAGE
(V)
37881
G24
Maximum Current Sense
Threshold vs Duty Cycle
120
100
80
60
40
20
0
0 10 20 30 40 50 60 70 80 90 100
DUTY CYCLE (%)
37881 G25
Charge Pump Charging Current
vs Operating Frequency
80
VSW = 12V
70 VBOOST – VSW = 4.5V
T = –45°C
60
T = 25°C
50
40
T = 130°C
30
20
10
0
50 150 250 350 450 550 650 750
OPERATING FREQUENCY (kHz)
37881 G26
PIN FUNCTIONS
ITH1, ITH2 (Pin 1, Pin 13): Current Control Threshold
and Error Amplifier Compensation Point. The voltage on
this pin sets the current trip threshold.
VFB1, VFB2 (Pin 2, Pin 12): Error Amplifier Feedback
Input. This pin receives the remotely sensed feedback
voltage from an external resistive divider connected across
the output.
SENSE1+, SENSE2+ (Pin 3, Pin 11): Positive Current
Sense Comparator Input. The (+) input to the current
comparator is normally connected to the positive terminal
of a current sense resistor. The current sense resistor is
normally placed at the input of the boost controller in
series with the inductor. This pin also supplies power to
the current comparator.
37881fa
8
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