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參數(shù)資料
| 型號： | LT1172S8 |
| 廠商： | Linear Technology Corporation |
| 英文描述： | Quadruple 2-Line To 1-Line Data Selectors/Multiplexers With 3-State Outputs 16-PDIP 0 to 70 |
| 中文描述： | 100kHz時，5A條，包2.5a和1.25A的高效率開關(guān)穩(wěn)壓器 |
| 文件頁數(shù)： | 7/20頁 |
| 文件大?。?/td> | 266K |
| 代理商： | LT1172S8 |
7
LT1170/LT1171/LT1172
1.24V
REF
1170/1/2 BD
ERROR
AMP
+
100kHz
OSC
2.3V
REG
V
IN
FB
–
+
–
SHUTDOWN
CIRCUIT
V
C
COMP
LOGIC
DRIVER
ANTI-
SAT
FLYBACK
ERROR
AMP
16V
SWITCH
OUT
5A, 75V
SWITCH
0.02
(0.04
(0.16
LT1171)
LT1172)
0.16
CURRENT
AMP
GAIN 6
0.15V
ALWAYS CONNECT E1 TO THE GROUND PIN ON MINIDIP, 8- AND 16-PIN SURFACE MOUNT PACKAGES.
E1 AND E2 INTERNALLY TIED TO GROUND ON TO-3 AND TO-220 PACKAGES.
MODE
SELECT
E1
E2
(LT1170 AND LT1171 ONLY)
LT1172
The LT1170/LT1171/LT1172 are current mode switchers.
This means that switch duty cycle is directly controlled by
switch current rather than by output voltage. Referring to
the block diagram, the switch is turned “on” at the start of
each oscillator cycle. It is turned “off” when switch current
reaches a predetermined level. Control of output voltage is
obtained by using the output of a voltage sensing error
amplifier to set current trip level. This technique has
several advantages. First, it has immediate response to
input voltage variations, unlike ordinary switchers which
have notoriously poor line transient response. Second, it
reduces the 90
°
phase shift at midfrequencies in the
energy storage inductor. This greatly simplifies closed-
loop frequency compensation under widely varying input
voltage or output load conditions. Finally, it allows simple
pulse-by-pulse current limiting to provide maximum switch
protection under output overload or short conditions. A
low dropout internal regulator provides a 2.3V supply for
all internal circuitry on the LT1170/LT1171/LT1172. This
low dropout design allows input voltage to vary from 3V to
60V with virtually no change in device performance. A
100kHz oscillator is the basic clock for all internal timing.
It turns “on” the output switch via the logic and driver
circuitry. Special adaptive anti-sat circuitry detects onset
of saturation in the power switch and adjusts driver
current instantaneously to limit switch saturation. This
minimizes driver dissipation and provides very rapid turn-
off of the switch.
A 1.2V bandgap reference biases the positive input of the
error amplifier. The negative input is brought out for
output voltage sensing. This feedback pin has a second
OPERATIOU
BLOCK DIAGRA
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LT1172HVIQ | RADIATION HARDENED HIGH EFFICIENCY, 5 AMP SWITCHING REGULATORS |
| LT1170HVC | RADIATION HARDENED HIGH EFFICIENCY, 5 AMP SWITCHING REGULATORS |
| LT1170HVCT | RADIATION HARDENED HIGH EFFICIENCY, 5 AMP SWITCHING REGULATORS |
| LT1170HVI | CAPACITOR, 0805, 100NF, 50V; Application:Standard; Capacitance:0.1uF; Tolerance, capacitance:+80% / -20%; Series:08055G; Voltage, rating:50V dc; Capacitor dielectric type:Ceramic Multi-Layer; Case style:0805; Dielectric RoHS Compliant: Yes |
| LT1170HVIT | RADIATION HARDENED HIGH EFFICIENCY, 5 AMP SWITCHING REGULATORS |
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| LT1173CN8 | 功能描述:IC REG BUCK BST INV ADJ .4A 8DIP RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開關(guān)穩(wěn)壓器 系列:- 標準包裝:2,500 系列:- 類型:升壓（升壓） 輸出類型:可調(diào)式 輸出數(shù):1 輸出電壓:1.24 V ~ 30 V 輸入電壓:1.5 V ~ 12 V PWM 型:電流模式，混合 頻率 - 開關(guān):600kHz 電流 - 輸出:500mA 同步整流器:無 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:8-SOIC（0.154"，3.90mm 寬） 包裝:帶卷 (TR) 供應(yīng)商設(shè)備封裝:8-SOIC |
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