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LT1738 Datasheet(PDF) 8 Page - Linear Technology

Part # LT1738
Description  Slew Rate Controlled Ultralow Noise DC/DC Controller
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LT1738 Datasheet(HTML) 8 Page - Linear Technology

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LT1738
1738fa
VC (Pin 12): The compensation pin is used for frequency
compensation and current limiting. It is the output of the
error amplifier and the input of the current comparator.
Loop frequency compensation can be performed with an
RC network connected from the VC pin to ground. The
voltage on VC is proportional to the switch peak current.
The normal range of voltage on this pin is 0.25V to 1.27V.
However, during slope compensation the upper clamp
voltage is allowed to increase with the compensation.
During a short-circuit fault the VC pin will be discharged to
ground.
PI FU CTIO S
BLOCK DIAGRA
Figure 1a. Typical Test Circuitry
+
VC
NFB
FB
1738 BD
SS
SLEW
CONTROL
VREG
VIN
V5
TO
DRIVERS
SQ
FF
R
OSCILLATOR
–
+
NEGATIVE
FEEDBACK
AMP
+
–
ERROR
AMP
1.25V
100k
50k
COMP
–
+
SENSE
AMP
SHDN
RVSL
RCSL
REGULATOR
RT
CT
CAP
GATE
GCL
PGND
SYNC
GND
SUB
CS
4
11
6
7
8
13
9
10
14
17
5
15
16
12
20
1
2
3
Figure 1b. Test Circuit for Slew
+
–
5pF
IN5819
20mA
2
1738 F01a
ZVN3306A
10
GATE
CAP
+
–
5pF
IN5819
0.9A
0.1
1738 F01b
Si4450DY
10
GATE
CS
CAP
TEST CIRCUITS


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