LT1175 データシートの表示（PDF） - Linear Technology
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LT1175 Datasheet PDF : 18 Pages
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LT1175
Typical Performance Characteristics
Shutdown Input Current
25
20
15
TJ = 25°C
TJ = 125°C
10
TJ = –55°C
5
0
0
5
10
15
20
25
INPUT VOLTAGE (V)
1175 G07
Shutdown Thresholds
2.5
POSITIVE THRESHOLD
2.0
1.5
NEGATIVE THRESHOLD
1.0
0.5
DEVICE IS OFF
BELOW THRESHOLD
0
–50 –25 0 25 50 75
TEMPERATURE (°C)
100 125
1175 G08
SHDN Pin Characteristics
15
VIN = 25V
CHARACTERISTICS DO NOT
10
CHANGE SIGNIFICANTLY WITH
TEMPERATURE, SO A SINGLE
CURVE IS SHOWN. POSITIVE
CURRENT FLOWS INTO
5 SHDN PIN
0
IF SHDN PIN IS NEGATIVE WITH
RESPECT TO INPUT VOLTAGE AND
–5
INPUT VOLTAGE IS LESS THAN 15V,
NEGATIVE BREAKOVER POINT WILL
BE ABOUT 8V BELOW –VIN
–10
–25 –20 –15 –10 –5 0 5 10 15 20 25
SHUTDOWN TO GROUND VOLTAGE (V)
1175 G09
GND Pin Current
20
16
12
8
4
0
0
POWER
TRANSISTOR
IN DROPOUT
TJ = –55°C
TJ = 25°C
VIN – VOUT = 2V
TJ = 25°C
VIN – VOUT ≥ 3V
TJ = 25°C
0.1 0.2 0.3 0.4 0.5 0.6 0.7
OUTPUT CURRENT (A)
1175 G10
Ripple Rejection
100
VOUT = 12V
(ADJUSTABLE)
80
WITH 0.1µF ACROSS
DIVIDER RESISTOR
60
40
VOUT = 12V
(ADJUSTABLE)
VOUT = 5V
(FIXED)
20 IOUT = 100mA
VIN – VOUT = 2V
COUT = 1µF TANT
0
10
100
1k
10k 100k 1M
FREQUENCY (Hz)
RIPPLE REJECTION IS RELATIVELY INDEPENDENT OF
INPUT VOLTAGE AND LOAD FOR CURRENTS BETWEEN
25mA AND 500mA. LARGER OUTPUT CAPACITORS DO
NOT IMPROVE REJECTION FOR FREQUENCIES BELOW
50kHz. AT VERY LIGHT LOADS, REJECTION WILL
IMPROVE WITH LARGER OUTPUT CAPACITORS 1175 G11
1175fe
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