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參數(shù)資料
| 型號： | HA16116FPJ |
| 廠商： | Hitachi,Ltd. |
| 元件分類： | 基準電壓源/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安培開關穩(wěn)壓器 |
| 文件頁數(shù)： | 19/34頁 |
| 文件大?。?/td> | 250K |
| 代理商： | HA16116FPJ |
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HA16116FP/FPJ, HA16121FP/FPJ
19
7.2 Adjusting UVL Voltage (when intermittent operation is not used)
The UVL voltage setting in this IC series can be adjusted externally as shown below.
Using the relationships shown in the figure, the UVL voltage in relation to V
IN
can be adjusted by changing
the relative values of V
TH
and V
TL
.
When the IC is operating, transistor Q
4
is off, so V
ON
= 3V
BE
≈
2.1 V. Accordingly, by connecting resistors
R
C
and R
D
, the voltage at which UVL is cancelled is as follows.
V
IN
= 2.1 V
R
C
+ R
D
R
D
×
This V
IN
is simply the supply voltage at which the UVL stops functioning, so in this state Vref is still below
2.5 V. In order to restore Vref to 2.5 V, a V
IN
of approximately 4.3 V should be applied.
With this IC series, V
ON/
OFF
makes use of the V
BE
of internal transistors, so when designing a power supply
system it should be noted that V
ON
has a temperature dependency of around –6 mV/°C.
R
C
R
D
TIM
(open)
ON/OFF
GND
50 k
P.V
IN
S.V
IN
V
IN
Q
1
Q
2
Q
3
Q
4
Vref output
Vref
generation
circuit
To other circuitry
To latch
Vref
3
2
1
00
1
2
V
ON/OFF
3
4
5
V
1.4 V
OFF
V
2.1 V
ON
2.5 V
V 4.5 V
To output
stage
On/off hysteresis circuit
Figure 7.2 Adjusting UVL Voltage
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| HA16117 | 制造商:HITACHI 制造商全稱:Hitachi Semiconductor 功能描述:CMOS Watchdog Timer |
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