參數(shù)資料
型號(hào)： LT1432
廠商： Linear Technology Corporation
英文描述： 5V High Efficiency Step-Down Switching Regulator Controller
中文描述： 5V的高效率降壓型開關(guān)穩(wěn)壓控制器
文件頁數(shù)： 24/28頁
文件大?。?/td> 611K
代理商： LT1432
24
LT1432
POSITIVE TOU
U
The circuit in Figure 22 will convert a variable positive input
voltage to a regulated –5V output. By selecting different
members of the LT1070 family, this basic design can
provide up to 6A output current at high input voltages, and
up to 3A with a five volt input supply. As shown using an
LT1271, maximum load current has been reduced to 1A by
utilizing the current limit circuit in the LT1432. Unlike a
positive buck converter, it is not possible to sense output
current directly. Instead, switch/inductor current is sensed.
This would normally result in a DC output current limit
value that changes considerably with input voltage, but the
addition of R2 and R3 alters peak current limit as a function
of input voltage to correct for this effect. Maximum load
current and short circuit current are shown as a function
Figure 22. Positive-to-Negative Converter
of input voltage in Figure 23. A 0.02
sense resistor was
used, so other values of current limit can be scaled from
this value.
This circuit uses the same basic connections between the
LT1432 and the LT1271 as the buck converter. The differ-
ence is in the way power flows in the catch diode, inductor,
and switch. In a buck converter, current flows simulta-
neously in the switch, inductor, and output. This makes
maximum output current approximately equal to maxi-
mum switch current. In inverting designs, current deliv-
ered to the output is zero during switch on-time. The
switch allows current to flow directly from the input supply
through the inductor to ground. At switch turn-off, induc-
V
SW
FB
GND
V
IN
V
C
LT1271
C1
330
μ
F
35V
C3
22
μ
F
16V
R1
680
C6
0.02
μ
F
D2
1N4148
C2
1000
μ
F
16V
L1
50
μ
H
INPUT
4.5V – 25V
D1
MBR330p
C4
0.047
μ
F
R3
100k
+
+
R2
100
C5
0.03
μ
F
× ×
OPTIONAL
OUTPUT
FILTER
100
μ
F
16V
10
μ
H
3A
+
–5V
OUTPUT
LT1432 F22
+
R4
0.02
V
C
GND
V
IN
MODE
DIODE
V
OUT
V
LIM
V
+
LT1432
相關(guān)PDF資料
PDF描述
LT1432-3.3 RADIATION HARDENED HIGH EFFICIENCY, 5 AMP SWITCHING REGULATORS
LT1432CN8 5V High Efficiency Step-Down Switching Regulator Controller
LT1432CN8-3.3 RADIATION HARDENED HIGH EFFICIENCY, 5 AMP SWITCHING REGULATORS
LT1432CS8 5V High Efficiency Step-Down Switching Regulator Controller
LT1432CS8-3.3 RADIATION HARDENED HIGH EFFICIENCY, 5 AMP SWITCHING REGULATORS
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LT1432-3.3 制造商:LINER 制造商全稱:Linear Technology 功能描述:3.3V High Efficiency Step-Down Switching Regulator Controller
LT1432CN8 制造商:LINER 制造商全稱:Linear Technology 功能描述:5V High Efficiency Step-Down Switching Regulator Controller
LT1432CN8-3.3 功能描述:IC REG CTRLR BUCK PWM 8-DIP RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標(biāo)準(zhǔn)包裝:4,000 系列:- PWM 型:電壓模式 輸出數(shù):1 頻率 - 最大:1.5MHz 占空比:66.7% 電源電壓:4.75 V ~ 5.25 V 降壓:是 升壓:無 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 85°C 封裝/外殼:40-VFQFN 裸露焊盤 包裝:帶卷 (TR)
LT1432CS8 制造商:Linear Technology 功能描述:
LT1432CS8-3.3 制造商:LINER 制造商全稱:Linear Technology 功能描述:3.3V High Efficiency Step-Down Switching Regulator Controller
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