参数资料
型号: LT3430IFE-1#PBF
厂商: Linear Technology
文件页数: 23/28页
文件大小: 0K
描述: IC REG BUCK ADJ 3A 16TSSOP
标准包装: 95
类型: 降压(降压)
输出类型: 可调式
输出数: 1
输出电压: 1.2 V ~ 54 V
输入电压: 5.5 V ~ 60 V
PWM 型: 电流模式
频率 - 开关: 100kHz
电流 - 输出: 3A
同步整流器:
工作温度: -40°C ~ 125°C
安装类型: 表面贴装
封装/外壳: 16-TSSOP(0.173",4.40mm)裸露焊盘
包装: 管件
供应商设备封装: 16-TSSOP-EP
产品目录页面: 1331 (CN2011-ZH PDF)
LT3430/LT3430-1
APPLICATIONS INFORMATION
( R 4 )( C SS )( V OUT )
LT3430/LT3430-1willconsumetheirquiescentoperating
current of 1.5mA. The V IN pin will also source current to
any other components connected to the input line. If this
load is greater than 10mA or the input could be shorted to
ground, a series Schottky diode must be added, as shown
in Figure 12. With these safeguards, the output can be held
at voltages up to the V IN absolute maximum rating.
output. Output rise time is controlled by the current through
C SS de?ned by R4 and Q1’s V BE . 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 =
V BE
(
)(
)
47 ? 10 15 ? 10 – 9 ( 5 )
BUCK CONVERTER WITH ADJUSTABLE SOFT-START
Large capacitive loads or high input voltages can cause
Using the values shown in Figure 10,
3
Rise Time =
0 . 7
= 5 ms
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
con?guration with the addition of R3, R4, C SS and Q1. As
the output starts to rise, Q1 turns on, regulating switch
current via the V C pin to maintain a constant dv/dt at the
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.
D2
MMSD914TI
REMOVABLE
INPUT
D3
30BQ060
54k
25k
V IN
SHDN
SYNC
GND
BOOST
LT3430
SW
BIAS
FB
V C
C2
0.68 μ F
33 μ H
D1
30BQ060
R1
15.4k
R2
4.99k
+
5V, 2A
C1
100 μ F
10V
ALTERNATE
SUPPLY
C3
4.7 μ F
R C
3.3k
C F
220pF
C C
0.022 μ F
3430 F12
Figure 12. Dual Source Supply with 25μA Reverse Leakage
D2
MMSD914TI
C2
0.68 μ F
C1
10V
INPUT
40V
C3
4.7 μ F
50V
CER
BOOST BIAS
V IN SW
LT3430
L1
33 μ H
D1
30BQ060 100 μ F
OR B250A
+
R1
15.4k
OUTPUT
5V
2A
SHDN
FB
SYNC GND
V C
R2
4.99k
R C
3.3k
C C
0.022 μ F
C F
220pF Q1
R3
2k
R4
47k
C SS
15nF
3430 F13
L1: CDRH104R-220M
Figure 13. Buck Converter with Adjustable Soft-Start
34301fa
23
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