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參數(shù)資料
| 型號： | LT1432CN8 |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 5V High Efficiency Step-Down Switching Regulator Controller |
| 中文描述： | SWITCHING CONTROLLER, PDIP8 |
| 封裝： | PLASTIC, DIP-8 |
| 文件頁數(shù)： | 9/28頁 |
| 文件大?。?/td> | 611K |
| 代理商： | LT1432CN8 |
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9
LT1432
U
S
A
O
PPLICATI
U
U
0
1A/DIV
0
5V/DIV
0
0
1A/DIV
5V/DIV
0
0
0.5A/DIV
Figure 5
5V/DIV
often allow the power-down sequence to consist of simul-
taneous turn-off of load current and switch to burst mode.
Power-up is accomplished by switching to normal mode
and simultaneously increasing load current to the lowest
possible value (30mA to 500mA), followed by a short
pause and return to full load current.
Full Shutdown
When the mode pin is driven high, full shutdown of the
regulator occurs. Regulator input current will then consist
of the LT1432 shutdown current (
≈
15
μ
A) plus the switch
leakage of the switching IC (
≈
1
μ
A to 25
μ
A). Mode input
current (
≈
15
μ
A at 5V) must also be considered. Startup
from shutdown can be in either normal or burst mode, but
one should always check startup overshoot, especially if
the output capacitor or frequency compensation compo-
nents have been changed.
Switching Waveforms in Normal Mode
The waveforms in Figures 3 through 10 were taken with
an input voltage of 12V. Figure 3 shows the classic buck
converter waveforms of switch output voltage (5V/DIV) at
the top and switch current (1A/DIV) underneath, at an
output current of 2A. The regulator is operating in “con-
tinuous” mode as evidenced by the fact that switch
current does not start at zero at switch turn-on. Instead,
it jumps to an initial value, then continues to slope upward
during the duration of switch on time. The slope of the
current waveform is determined by the difference be-
tween input and output voltage, and the value of inductor
used.
=
(
dl
dt
V – V
L
OUT
)
According to theory, the average switch current during
switch on time should be equal to the 2A output current
and this is confirmed in the photograph. The peak switch
current, however, is about 2.4A.This peak current must
be considered when calculating maximum available load
current because both the LT1432 and the LT1070 family
current limit on instantaneous switch current.
5
μ
s/DIV
5
μ
s/DIV
Figure 4
Figure 3
5
μ
s/DIV
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| LT1432CN8-3.3 | RADIATION HARDENED HIGH EFFICIENCY, 5 AMP SWITCHING REGULATORS |
| LT1432CS8 | 5V High Efficiency Step-Down Switching Regulator Controller |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| 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:- 標準包裝: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 |
| LT1435 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:4.5A, 500kHz Step-Down Switching Regulator |
| LT1436 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:4.5A, 500kHz Step-Down Switching Regulator |
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