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參數(shù)資料
| 型號(hào)： | LT1617 |
| 廠商： | Linear Technology Corporation |
| 英文描述： | Micropower Inverting DC/DC Converters in SOT-23(微功耗反相DC/DC變換器（SOT-23封裝）) |
| 中文描述： | 微倒轉(zhuǎn)DC / DC轉(zhuǎn)換器采用SOT - 23（微功耗反相直流/直流變換器（采用SOT - 23封裝）） |
| 文件頁(yè)數(shù)： | 4/8頁(yè) |
| 文件大?。?/td> | 136K |
| 代理商： | LT1617 |
4
LT1617/LT1617-1
BLOCK DIAGRA
W
Figure 1. LT1617 Block Diagram
–
+
–
+
5
400ns
ONE-SHOT
DRIVER
RESET
ENABLE
42mV*
0.12
A2
A1
Q3
2
R4
280k
R3
60k
R6
80k
R5
80k
Q2
X10
Q1
3
V
IN
NFB
4
SHDN
1
SW
GND
1617/-1 BD
L1
C2
V
OUT
V
IN
D1
R2
(EXTERNAL)
R1
(EXTERNAL)
V
OUT
C1
L2
C3
* 12mV FOR LT1617-1
OPERATIOU
The LT1617 uses a constant off-time control scheme to
provide high efficiencies over a wide range of output
current. Operation can be best understood by referring to
the block diagram in Figure 1. Q1 and Q2 along with R3 and
R4 form a bandgap reference used to regulate the output
voltage. When the voltage at the NFB pin is slightly below
–1.23V, comparator A1 disables most of the internal
circuitry. Output current is then provided by capacitor C2,
which slowly discharges until the voltage at the NFB pin
goes above the hysteresis point of A1 (typical hysteresis
at the NFB pin is 8mV). A1 then enables the internal
circuitry, turns on power switch Q3, and the current in
inductors L1 and L2 begins ramping up. Once the switch
current reaches 350mA, comparator A2 resets the one-
shot, which turns off Q3 for 400ns. L2 continues to deliver
current to the output while Q3 is off. Q3 turns on again and
the inductor currents ramp back up until the switch
current reaches 350mA, then A2 again resets the one-
shot. This switching action continues until the output
voltage is charged up (until the NFB pin reaches –1.23V),
then A1 turns off the internal circuitry and the cycle
repeats. The LT1617-1 operates in the same manner,
except the switch current is limited to 100mA (the A2
reference voltage is 12mV instead of 42mV).
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LT1618EMS | Constant-Current/ Constant-Voltage 1.4MHz Step-Up DC/DC Converter |
| LT1618 | Constant-Current/ Constant-Voltage 1.4MHz Step-Up DC/DC Converter(恒定電流/恒定電壓，1.4MHz,步升DC/DC變換器) |
| LT1619 | Low Voltage Current Mode PWM Controller |
| LT1619ES8 | Low Voltage Current Mode PWM Controller |
| LT1619EMS8 | Low Voltage Current Mode PWM Controller |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LT1617-1 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:Inverting Micropower DC/DC Converter with Schottky in ThinSOT Package |
| LT1617ES5 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:Micropower Inverting DC/DC Converters in SOT-23 |
| LT1617ES5#PBF | 制造商:Linear Technology 功能描述: 制造商:Linear Technology 功能描述:SP-SWREG/Monolithic, CUT TAPE Micropower Inverting DC/DC Converters in SOT-23 制造商:Linear Technology 功能描述:IC, DC/DC CONVERTER, 5-SOT-23, Primary Input Voltage:12V, No. of Outputs:1, Output Voltage:34V, Output Current:350mA, No. of Pins:5, Operating Temperature Min:-40C, Operating Temperature Max:85C, MSL:MSL 1 - Unlimited , RoHS Compliant: Yes |
| LT1617ES5#PBF | 制造商:Linear Technology 功能描述:IC DC/DC CONVERTER 制造商:Linear Technology 功能描述:IC, DC/DC CONVERTER, 5-SOT-23 |
| LT1617ES5#TR | 功能描述:IC REG INV ADJ 0.35A TSOT23-5 RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開(kāi)關(guān)穩(wěn)壓器 系列:- 標(biāo)準(zhǔn)包裝:500 系列:- 類型:切換式電容器（充電泵），反相 輸出類型:固定 輸出數(shù):1 輸出電壓:-3V 輸入電壓:2.3 V ~ 5.5 V PWM 型:Burst Mode? 頻率 - 開(kāi)關(guān):900kHz 電流 - 輸出:100mA 同步整流器:無(wú) 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:SOT-23-6 細(xì)型，TSOT-23-6 包裝:帶卷 (TR) 供應(yīng)商設(shè)備封裝:TSOT-23-6 其它名稱:LTC1983ES6-3#TRMTR |
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