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參數(shù)資料
| 型號： | LT1933 |
| 廠商： | Linear Technology Corporation |
| 元件分類： | 基準(zhǔn)電壓源/電流源 |
| 英文描述： | RADIATION HARDENED HIGH EFFICIENCY, 5 AMP SWITCHING REGULATORS |
| 中文描述： | 抗輻射高效，5安培開關(guān)穩(wěn)壓器 |
| 文件頁數(shù)： | 12/16頁 |
| 文件大?。?/td> | 629K |
| 代理商： | LT1933 |
12
LT1933
1933f
Figure 5. Diode D4 Prevents a Shorted Input from Discharging
a Backup Battery Tied to the Output; It Also Protects the Circuit
from a Reversed Input. The LT1933 Runs Only When the Input
is Present
V
IN
BOOST
GND
FB
SHDN
SW
5
D4
V
IN
4
1
6
2
3
LT1933
1933 F05
V
OUT
BACKUP
D4: MBR0540
APPLICATIU
pull large currents from the output through the SW pin and
the V
IN
pin. Figure 5 shows a circuit that will run only when
the input voltage is present and that protects against a
shorted or reversed input.
W
U
U
Hot Plugging Safely
The small size, robustness and low impedance of ceramic
capacitors make them an attractive option for the input
bypass capacitor of LT1933 circuits. However, these ca-
pacitors can cause problems if the LT1933 is plugged into
a live supply (see Linear Technology Application Note 88
for a complete discussion). The low loss ceramic capaci-
tor combined with stray inductance in series with the
power source forms an under damped tank circuit, and the
voltage at the V
IN
pin of the LT1933 can ring to twice the
nominal input voltage, possibly exceeding the LT1933’s
rating and damaging the part. If the input supply is poorly
controlled or the user will be plugging the LT1933 into an
energized supply, the input network should be designed to
prevent this overshoot.
Figure 6 shows the waveforms that result when an LT1933
circuit is connected to a 24V supply through six feet of 24-
gauge twisted pair. The first plot is the response with a
+
+
LT1933
2.2
μ
F
V
IN
20V/DIV
I
IN
5A/DIV
20
μ
s/DIV
V
IN
CLOSING SWITCH
SIMULATES HOT PLUG
I
IN
(6a)
(6b)
(6c)
LOW
IMPEDANCE
ENERGIZED
24V SUPPLY
STRAY
INDUCTANCE
DUE TO 6 FEET
(2 METERS) OF
TWISTED PAIR
+
+
LT1933
2.2
μ
F
10
μ
F
35V
AI.EI.
LT1933
2.2
μ
F
0.1
μ
F
1
1933 F06
V
IN
20V/DIV
I
IN
5A/DIV
20
μ
s/DIV
V
IN
20V/DIV
I
IN
5A/DIV
20
μ
s/DIV
DANGER!
RINGING V
MAY EXCEED
ABSOLUTE MAXIMUM
RATING OF THE LT1933
Figure 6. A Well Chosen Input Network Prevents Input Voltage Overshoot and
Ensures Reliable Operation When the LT1933 is Connected to a Live Supply
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| LT1934ES6-1 | RADIATION HARDENED HIGH EFFICIENCY, 5 AMP SWITCHING REGULATORS |
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| LT1934 | 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 |
|---|---|
| LT1933_1 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:600mA, 500kHz Step-Down Switching Regulator in SOT-23 and DFN Packages |
| LT1933ES6 | 制造商:Linear Technology 功能描述:Conv DC-DC Single Step Down 3.6V to 36V 6-Pin TSOT-23 |
| LT1933ES6#PBF | 制造商:Linear Technology 功能描述:IC STEP-DOWN REGULATOR 6-TSOT-23 |
| LT1933ES6#TR | 功能描述:IC REG BUCK ADJ 0.6A TSOT23-6 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(biāo)準(zhǔn)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 |
| LT1933ES6#TRM | 功能描述:IC REG BUCK ADJ 0.6A TSOT23-6 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(biāo)準(zhǔn)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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