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參數(shù)資料
| 型號(hào)： | LT1931ES5 |
| 文件頁數(shù)： | 8/12頁 |
| 文件大小： | 210K |
| 代理商： | LT1931ES5 |
8
LT1931/LT1931A
increased to 68nF, resulting in a lower peak input current
of 350mA with a V
OUT
ramp time of 1.6ms. C
SS
or R
SS
can
be increased further for an even slower ramp, if desired.
Diode D2 serves to quickly discharge C
SS
when V
SS
is
driven low to shut down the device. D2 can be omitted,
resulting in a “soft-stop” slow discharge of the output
capacitor.
1
2
3
5
4
C2
D1
R2
R1
L1B
C1
L1A
+
+
SHUTDOWN
1931 F10
–V
OUT
GND
V
IN
C3
V
2V/DIV
I
IN
0.5A/DIV
AC COUPLED
5V
0V
V
SS
200
μ
s/DIV
1931 F08
Figure 8. R
SS
= 15k, C
SS
= 33nF; V
OUT
Reaches –5V in 1ms;
Input Current Peaks at 500mA
V
2V/DIV
I
IN
0.5A/DIV
AC COUPLED
5V
0V
V
SS
500
μ
s/DIV
1931 F09
Figure 9. R
SS
= 15k, C
SS
= 68nF; V
OUT
Reaches –5V in 1.6ms;
Input Current Peaks at 350mA
Figure 10. Suggested Component Placement.
Note Cut in Ground Copper at D1’s Cathode
APPLICATIOU
W
U
U
DIODE SELECTION
A Schottky diode is recommended for use with the LT1931/
LT1931A. The Motorola MBR0520 is a very good choice.
Where the input to output voltage differential exceeds 20V,
use the MBR0530 (a 30V diode). These diodes are rated to
handle an average forward current of 0.5 A. In applications
where the average forward current of the diode exceeds
0.5A, a Microsemi UPS5817 rated at 1A is recommended.
LAYOUT HINTS
The high-speed operation of the LT1931/LT1931A de-
mands careful attention to board layout. You will not get
advertised performance with careless layout. Figure 10
shows the recommended component placement. The
ground cut at the cathode of D1 is essential for low noise
operation.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LT1931ES5#PBF | 制造商:Linear Technology 功能描述:Conv DC-DC Single Inv 2.45V to 16V 5-Pin TSOT-23 制造商:Linear Technology 功能描述:IC SEMICONDUCTOR ((NS)) 制造商:Linear Technology 功能描述:IC, DC/DC CONVERTER, 5-TSOT-23; Primary Input Voltage:16V; No. of Outputs:1; Output Voltage:-12V; Output Current:350mA; No. of Pins:5; Operating Temperature Min:-40C; Operating Temperature Max:85C; MSL:MSL 1 - Unlimited ;RoHS Compliant: Yes |
| LT1931ES5#PBF | 制造商:Linear Technology 功能描述:IC |
| LT1931ES5#TR | 功能描述:IC REG INV 1A TSOT23-5 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 |
| LT1931ES5#TRM | 功能描述:IC REG INV 1A TSOT23-5 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 |
| LT1931ES5#TRMPBF | 功能描述:IC REG INV 1A TSOT23-5 RoHS:是 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:250 系列:- 類型:降壓（降壓） 輸出類型:固定 輸出數(shù):1 輸出電壓:1.2V 輸入電壓:2.05 V ~ 6 V PWM 型:電壓模式 頻率 - 開關(guān):2MHz 電流 - 輸出:500mA 同步整流器:是 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:6-UFDFN 包裝:帶卷 (TR) 供應(yīng)商設(shè)備封裝:6-SON（1.45x1） 產(chǎn)品目錄頁面:1032 (CN2011-ZH PDF) 其它名稱:296-25628-2 |
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