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| 型号： | LT1074HVCT7#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 10/16页 |
| 文件大小： | 0K |
| 描述： | IC REG MULTI CONFIG ADJ TO220-7 |
| 标准包装： | 50 |
| 类型： | 降压（降压），升压（升压），反相，回扫 |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 2.5 V ~ 50 V |
| 输入电压： | 8 V ~ 64 V |
| 频率 - 开关： | 100kHz |
| 电流 - 输出： | 5A |
| 同步整流器： | 无 |
| 工作温度： | 0°C ~ 70°C |
| 安装类型： | 通孔 |
| 封装/外壳： | TO-220-7 成形引线 |
| 包装： | 管件 |
| 供应商设备封装： | TO-220-7 |
| 产品目录页面： | 1325 (CN2011-ZH PDF) |
LT1074/LT1076
PI DESCRIPTIO S
V IN
Hysteresis in undervoltage lockout may be accomplished
10 μ A
300 μ A
by connecting a resistor (R3) from the I LIM pin to the
shutdown pin as shown in Figure 7. D1 prevents the
SHUTDOWN
PIN
2.3V
–
+
C1
I LIM
PIN
shutdown divider from altering current limit.
V IN
R1
SHUT
–
Q1
6V
EXTERNAL
C LIM
R3
D1*
I LIM
LT1074
C2
R2
OPTIONAL CURRENT
0.3V
+
LIMIT RESISTOR
TO TOTAL
REGULATOR
SHUTDOWN
LT1074?PD07
*1N4148
Figure 7. Adding Hysteresis
LT1074?PD09
Trip Po int = V TP = 2 . 35 V ? 1 +
R 2 ?
Figure 5. Shutdown Circuitry
Undervoltage Lockout
?
?
R 1 ?
?
V UTP = V SH ? 1
? R 1 R 1 ? ? R 1 ?
? 0 . 8 V ?
?
?
V UTP ? V SH ? 1 + ?
UndervoltagelockoutpointissetbyR1andR2inFigure 6.
To avoid errors due to the 10 μ A shutdown pin current, R2
is usually set at 5k, and R1 is found from:
R 1 = R 2 ( V TP ? V SH )
V SH
V TP = Desired undervoltage lockout voltage
V SH = Threshold for lockout on the
shutdown pin = 2.45V
If quiescent supply current is critical, R2 may be increased
up to 15k ? , but the denominator in the formula for R2
should replace V SH with V SH – (10 μ A)(R2).
If R3 is added, the lower trip point (V IN descending) will be
the same. The upper trip point (V UTP ) will be:
+
? R 2 R 3 ? ? R 3 ?
If R1 and R2 are chosen, R3 is given by:
R 3 = ( V SH ? 0 . 8 V )( R 1 )
? R 1 ?
? R 2 ?
Example: An undervoltage lockout is required such that
the output will not start until V IN = 20V, but will continue
R1
V IN
to operate until V IN drops to 15V. Let R2 = 2.32k.
) (
(
(
)( )
?
12 . 5 ?
20 ? 2 . 35 ? 1 + ?
SHUT
LT1074
R2
GND
5k
LT1074?PD08
Figure 6. Undervoltage Lockout
15 V ? 2 . 35 V
R 1 = 2 . 34 k
2 . 35 V
2 . 35 ? 0 . 8 12 . 5
R 3 =
? 2 . 32 ?
) = 12 . 5 k
= 3 . 9 k
sn1074 1074fds
10
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相关代理商/技术参数 |
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| LT1074HVCTPBF | 制造商:Linear Technology 功能描述:DC-DC Converter Step-Down 8-60V TO220-5 |
| LT1074HVIT | 功能描述:IC REG MULTI CONFIG ADJ TO220-5 RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 设计资源:Design Support Tool 标准包装:1 系列:- 类型:升压（升压） 输出类型:固定 输出数:1 输出电压:3V 输入电压:0.75 V ~ 2 V PWM 型:- 频率 - 开关:- 电流 - 输出:100mA 同步整流器:是 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:SOT-23-5 细型，TSOT-23-5 包装:剪切带 (CT) 供应商设备封装:TSOT-23-5 其它名称:AS1323-BTTT-30CT |
| LT1074HVIT#06 | 制造商:Linear Technology 功能描述:Conv DC-DC Single Step Down 7.3V to 45V 5-Pin(5+Tab) TO-220 制造商:Linear Technology 功能描述:Step-Down Switching Regulator |
| LT1074HVIT#06PBF | 制造商:Linear Technology 功能描述:Conv DC-DC Single Step Down 7.3V to 45V 5-Pin(5+Tab) TO-220 制造商:Linear Technology 功能描述:IC REG MULTI CONFIG ADJ TO-220-5 制造商:Linear Technology 功能描述:BUCK 8V TO 60VIN 5A ADJ 5T 制造商:Linear Technology 功能描述:BUCK, 8V TO 60VIN, 5A, ADJ, 5TO220 制造商:Linear Technology 功能描述:IC, DC-DC CONV, 5A, 100kHZ, 5-TO-220; Primary Input Voltage:60V; No. of Outputs:1; Output Current:5A; No. of Pins:5; Operating Temperature Min:-40C; Operating Temperature Max:85C; MSL:MSL 1 - Unlimited; Package / Case:5-TO-220 ;RoHS Compliant: Yes |
| LT1074HVIT#30 | 制造商:Linear Technology 功能描述:Step-Down Switching Regulator |
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