LT1312 데이터 시트보기 (PDF) - Linear Technology
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LT1312 Datasheet PDF : 12 Pages
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LT1312
APPLICATIONS INFORMATION
5V
+
22µF
100µH
5
VIN
4
VSW
LT1172
2
FB
GND
VC
3
1
1k
+
1µF
1N5158
+
10k
1%
1k
1%
100µF
13.75V
VS
EN0 VPPOUT
EN1 LT1312
TO CARD VPP PIN
+
0V, 5V, 12V OR HI-Z
1µF
VALID SENSE
GND
LT1312 F4
Figure 4. Local 5V to 15V Boost Regulator for Line Operated Applications
12V
+
22µF
100µH
100Ω
2
1
VIN
3
ILIM
SW1
LT1111CS8
8
SENSE
GND SW2
5
4
1N5158
+
100k
1%
10k
1%
100µF
13.75V
VS
EN0 VPPOUT
EN1 LT1312
TO CARD VPP PIN
+
0V, 5V, 12V OR HI-Z
1µF
VALID SENSE
GND
LT1312 F5
Figure 5. Local 12V to 15V Boost Regulator for Line Operated Applications
This is easily accomplished by generating a local 14V
supply from a relatively “dirty” 5V or 12V supply as shown
in Figures 4 and 5. Precise voltage control (and further
filtering) is provided by the LT1312 driver/regulator. A
further advantage to this scheme is that it adds current
limit in series with the VPP pins to eliminate possible
damage to the card socket, the PC card, or the switching
power supply in the event of an accidental short circuit.
Output Capacitance
The LT1312 is designed to be stable with a wide range of
output capacitors. The minimum recommended value is a
1µF with an ESR of 3Ω or less. The capacitor is connected
directly between the output pin and ground as shown in
Figure 6.
For applications where space is very limited, capacitors as
low as 0.33µF can be used. Extremely low ESR ceramic
capacitors with values less than 1µF must have a 2Ω
resistor added in series with the output capacitor as shown
in shown in Figure 7.
13V TO 20V
0.1µF
VS
EN0 VPPOUT
EN1 LT1312
VALID SENSE
GND
+
LT1312 F6
>1µF TANTALUM
OR ALUMINUM
Figure 6. Recommended >1µF Tantalum Output Capacitor
13V TO 20V
0.1µF
VS
EN0 VPPOUT
EN1 LT1312
VALID SENSE
GND
2Ω
0.33µF
CERAMIC
LT1312 F7
Figure 7. Using a 0.33µF to 1µF Output Capacitor
9
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