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LT3430 Datasheet(PDF) 23 Page - Linear Technology

Part # LT3430
Description  High Voltage, 3A, 200kHz Step-Down Switching Regulator
PDF  28 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LT3430 Datasheet(HTML) 23 Page - Linear Technology

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23
LT3430
sn3430 3430is
APPLICATIO S I FOR ATIO
OUTPUT
5V
2A
INPUT
40V
3430 F13
C2
0.68
µF
C1
100
µF
10V
CSS
15nF
CF
220pF
D1
30BQ060
OR B250A
C3
4.7
µF
50V
CER
D2
MMSD914TI
L1
33
µH
R1
15.4k
R3
2k
CC
0.022
µF
R2
4.99k
R4
47k
L1: CDRH104R-220M
Q1
BOOST
BIAS
VIN
LT3430
SHDN
SYNC
SW
FB
VC
GND
+
RC
3.3k
Figure 13. Buck Converter with Adjustable Soft-Start
BUCK CONVERTER WITH ADJUSTABLE SOFT-START
Large capacitive loads or high input voltages can cause
high input currents at start-up. Figure 13 shows a circuit
that limits the dv/dt of the output at start-up, controlling
the capacitor charge rate. The buck converter is a typical
configuration with the addition of R3, R4, CSS and Q1.
As the output starts to rise, Q1 turns on, regulating switch
current via the VC pin to maintain a constant dv/dt at the
output. Output rise time is controlled by the current
through CSS defined by R4 and Q1’s VBE. Once the output
is in regulation, Q1 turns off and the circuit operates
normally. R3 is transient protection for the base of Q1.
Rise Time
RC
V
V
SS
OUT
BE
= ()(
)(
)
4
Using the values shown in Figure 10,
Rise Time
ms
= ()(
)()
=
47 10
15 10
5
07
5
39
••
.
–
The ramp is linear and rise times in the order of 100ms are
possible. Since the circuit is voltage controlled, the ramp
rate is unaffected by load characteristics and maximum
output current is unchanged. Variants of this circuit can be
used for sequencing multiple regulator outputs.
5V, 2A
REMOVABLE
INPUT
C2
0.68
µF
CF
220pF
54k
D1
30BQ060
3430 F12
C3
4.7
µF
RC
3.3k
CC
0.022
µF
D3
30BQ060
D2
MMSD914TI
33
µH
C1
100
µF
10V
ALTERNATE
SUPPLY
25k
R1
15.4k
R2
4.99k
BOOST
VIN
LT3430
SHDN
SYNC
SW
BIAS
FB
VC
GND
+
Figure 12. Dual Source Supply with 25
µA Reverse Leakage



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