LT1946 Ver la hoja de datos (PDF) - Linear Technology
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LT1946 Datasheet PDF : 12 Pages
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TYPICAL APPLICATIO S
Low Profile, Triple Output TFT Supply (10V, –10V, 20V)
LT1946
VIN
3.3V TO 5V
L1
5.4µH
6
5
3 VIN
SW
OFF ON SHDN
+
C1
4.7µF
8
SS LT1946
7
COMP
2
FB
VC
GND
CSS
100nF
1
4
RC
33.3k
CC
470pF
C1 TO C6: X5R OR X7R
C1: 4.7µF, 6.3V
C2: 2 × 10µF, 10V
C3: 1µF, 25V
C4: 2.2µF, 10V
C5, C6: 0.1µF, 10V
D1: MICROSEMI UPS120 OR EQUIVALENT
D2 TO D5: ZETEX BAT54S OR EQUIVALENT
L1: SUMIDA CDRH5D18-5R4
D1
C6
0.1µF
D2
R1
75k
R2
10.5k
D3
C5
0.1µF
C2
20µF
VON
20V
5mA
AVDD
10V
450mA, VIN = 5V
275mA, VIN = 3.3V
C3
1µF
D4
C4
2.2µF
D5
VOFF
–10V
1946 TA01 10mA
Efficiency
90
85
VIN = 5V
80
VIN = 3.3V
75
70
65
60
55 VON LOAD = 5mA
VOFF LOAD = 10mA
50
0
100 200 300 400 500
AVDD LOAD CURRENT (mA)
1946 TA01a
Transient Response
AVDD
50mV/DIV
AC COUPLED
ILI
0.5A/DIV
AVDD 150mA
LOAD 100mA
VIN = 5V
100µs/DIV
1946 TA01b
1946fb
9
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