LT1942 LINER [Linear Technology], LT1942 Datasheet - Page 9

• Manufacturer Part Number: LT1942
• Description: Quad DCDC Converter for Triple Outputs TFT Supply Plus LED Driver
• Manufacturer: LINER [Linear Technology]

BLOCK DIAGRA
SHDN
V
22
7
CC
CTRL4
AGND
10
8
SHOT
ONE
200mV
PGOOD
Q
13
ENABLE
ENABLE
OSCILLATOR
R
1MHz
S
W
FB1
REFERENCE
REFERENCE
90k
10k
–150mV
ENABLE
1.250V
FB4
14
NFB2
REFERENCE
6
SS4
1.250V
12
FB3
–
5
+
+
–
ENABLE
SOFT-START
–
+
+
–
SS1
+
–
11
28mV
+
–
RAMP-PULSE
GENERATOR
SOFT-START
Σ
RAMP-PULSE
RAMP-PULSE
GENERATOR
GENERATOR
Σ
Σ
–
+
COMPARATOR
RAMP-PULSE
GENERATOR
–
+
–
+
40V
COMPARATOR
COMPARATOR
Σ
V
OFF
V
ON
–
+
INVERTING CONVERTER
R
BOOST CONVERTER
COMPARATOR
S
R
R
AV
Q
DD
LED BOOST CONVERTER
S
S
BOOST CONVERTER
Q
Q
DRIVER
R
S
+
–
Q
DRIVER
DRIVER
SW4
1942BD
19
21
Q4
DRIVER
PGND14
+
–
+
–
D4
+
–
PGND23
SW3
PGND14
2
1
SW1
Q3
D4
16
20
Q1
SW2
24
Q2
GENERATOR
LT1942
D3
DELAY
DRIVE
D2
PNP
LED1
FB4
D3
18
15
3
Q6
D2
23
Q5
V
1942fa
9
OUT3
CT
LED2
4
9
17
Q7