LT1946A Ver la hoja de datos (PDF) - Linear Technology
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LT1946A Datasheet PDF : 12 Pages
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LT1946A
TYPICAL APPLICATIO S
Low Profile (< 1.1mm Tall) Triple Output TFT Supply (10V, –10V, 20V)
L1
VIN
1.5µH
5V
6
5
3 VIN
SW
OFF ON SHDN
+
C1
8
SS LT1946A
7
COMP
2
FB
4.7µF
VC
GND*
CSS
100nF
1
4
RC
59k
CC
150pF
C1–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–D5: ZETEX BAT54S OR EQUIVALENT
L1: COILCRAFT LP01704-152MC
* EXPOSED PAD MUST ALSO BE GROUNDED
D1
C6
0.1µF
D2
R1
75k
R2
10.5k
D3
C5
0.1µF
C2
20µF
VON
20V
5mA
AVDD
10V
475mA
C3
1µF
D4
C4
2.2µF
D5
VOFF
–10V
10mA
1946A TA02
AVDD
50mV/DIV
AC COUPLED
ILI
0.5A/DIV
AVDD
LOAD
350mA
200mA
Transient Response
100µs/DIV
1946A TA03
10
Efficiency
90
85
80
75
70
65
60
55
VON LOAD = 5mA
VOFF LOAD = 10mA
50
0
100 200 300 400 500
AVDD LOAD CURRENT (mA)
1946A TA04
sn1946a 1946afs
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