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参数资料
| 型号： | NCV8141D2TR4 |
| 厂商： | ON Semiconductor |
| 文件页数： | 7/13页 |
| 文件大小： | 0K |
| 描述： | IC REG LDO 5V .5A D2PAK-7 |
| 产品变化通告： | LTB Notification 03/Jan/2008 |
| 标准包装： | 750 |
| 稳压器拓扑结构： | 正，固定式 |
| 输出电压： | 5V |
| 输入电压： | 7 V ~ 26 V |
| 电压 - 压降（标准）： | 1.25V @ 500mA |
| 稳压器数量： | 1 |
| 电流 - 输出： | 500mA |
| 电流 - 限制（最小）： | 600mA |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | TO-263-8，D²Pak（7 引线+接片），TO-263CA |
| 供应商设备封装： | D2PAK-7 |
| 包装： | 带卷 (TR) |
NCV8141
Using an emitter sense scheme, the amount of current
through the NPN pass transistor is monitored. Feedback
circuitry insures that the output current never exceeds a
preset limit.
> 30 V
V IN
V OUT
ENABLE circuitry in the IC remains powered up, drawing
a quiescent current of less than 50 m A.
The Watchdog monitors the frequency of an incoming
WDI signal. If the signal falls below the WDI limit, a
frequency programmable pulse train is generated at the
RESET lead (Figure 9) until the correct Watchdog input
signal reappears at the lead (ENABLE = HIGH).
The threshold limit of the watchdog function is set by the
value of C DELAY . The limit is determined according to the
following equation for the NCV8141:
tWDI + (1.3
105)CDELAY or
I O
Load Short Thermal
Dump Circuit Shutdown
Figure 8. Typical Circuit Waveforms for Output
Stage Protection
Should the junction temperature of the power device
exceed 180 ° C (typ), the power transistor is turned off.
Thermal shutdown is an effective means to prevent die
overheating since the power transistor is the principle heat
source in the IC.
REGULATOR CONTROL FUNCTIONS
The NCV8141 differs from all other linear regulators in its
unique combination of control features.
The capacitor C DELAY also determines the frequency of
the RESET signal and the POWER ? ON ? RESET (POR)
delay period.
RESET Function
The RESET function is activated when the Watchdog
frequency signal is below the watchdog threshold
(Figure 9), when the regulator is in its power up state
(Figure 10) or when V OUT drops below V OUT ? 4.5% for
more than 2.0 m s (Figure 11)
If the Watchdog signal falls outside of the preset voltage
or below the frequency threshold, a frequency
programmable pulse train is generated at the RESET lead
(Figure 9) until the correct Watchdog input signal reappears
at the lead. The duration of the RESET pulse is determined
by C DELAY according to the following equation:
Watchdog and ENABLE Function
tWDI(RESET) + (1.0
104)CDELAY
V OUT is controlled by the logic functions ENABLE and
Watchdog (Table 1).
Table 1. V OUT as a Function of ENABLE and Watchdog
V OUT (V)
WDI
ENABLE Slow Normal High Low
RESET CIRCUIT WAVEFORMS WITH DELAYS
INDICATED
If an undervoltage condition exists, the voltage on the
RESET lead goes low and the delay capacitor, C DELAY , is
discharged. RESET remains low until output is in
regulation, the voltage on C DELAY exceeds the upper
threshold and the Watchdog input signal is valid (Figures 10
H
5
5
5
5
and 11). The delay after the output is in regulation is:
L
0
5
0
0
tPOR(typ) + (4.75
105)CDELAY
As long as ENABLE is high or ENABLE is low and the
Watchdog signal is normal, V OUT will be at 5.0 V (typ). If
ENABLE is low and the frequency of the Watchdog input
goes below the threshold frequency, the output transistor
turns off and the IC goes into SLEEP mode. Only the
The RESET delay circuit is also programmed with the
external cap C DELAY .
The output of the reset circuit is an open collector NPN.
RESET is operational down to V OUT = 1.0 V. Both RESET
and its delay are governed by comparators with hysteresis to
avoid undesirable oscillations.
http://onsemi.com
7
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相关代理商/技术参数 |
参数描述 |
|---|---|
| NCV8141D2TR4G | 功能描述:低压差稳压器 - LDO ANA WATCHDOG REG RoHS:否 制造商:Texas Instruments 最大输入电压:36 V 输出电压:1.4 V to 20.5 V 回动电压（最大值）:307 mV 输出电流:1 A 负载调节:0.3 % 输出端数量: 输出类型:Fixed 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-20 |
| NCV8184 | 制造商:ONSEMI 制造商全称:ON Semiconductor 功能描述:Micropower 70 mA Low Dropout Tracking Regulator/Line Driver |
| NCV8184/D | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Micropower 70mA Low Dropout Tracking Regulator / Line Driver |
| NCV8184_06 | 制造商:ONSEMI 制造商全称:ON Semiconductor 功能描述:Micropower 70 mA Low Dropout Tracking Regulator/Line Driver |
| NCV8184D | 功能描述:低压差稳压器 - LDO 70mA Tracking RoHS:否 制造商:Texas Instruments 最大输入电压:36 V 输出电压:1.4 V to 20.5 V 回动电压（最大值）:307 mV 输出电流:1 A 负载调节:0.3 % 输出端数量: 输出类型:Fixed 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-20 |
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