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參數(shù)資料
| 型號(hào)： | HA16114FPJ |
| 廠商： | Hitachi,Ltd. |
| 英文描述： | ID ISC.ANT.MUX 8X ANT MULTIPLEXR |
| 中文描述： | 開關(guān)穩(wěn)壓器的斬波式直流/直流轉(zhuǎn)換器 |
| 文件頁數(shù)： | 14/38頁 |
| 文件大?。?/td> | 275K |
| 代理商： | HA16114FPJ |
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HA16114P/PJ/FP/FPJ, HA16120FP/FPJ
14
The relation between Vref and the ADJ pin enables Vref to be trimmed by inserting one external resistor
(R
3
) between the Vref and ADJ pins and another (R
4
) between the ADJ pin and ground, to change the
resistance ratio. Vref is then determined by the combined resistance ratio of the internal R
1
and R
2
and
external R
3
and R
4
.
Vref = V
ADJ
×
R
A
+ R
B
R
B
Where, R
A
: parallel resistance of R
1
and R
3
R
B
: parallel resistance of R
2
and R
4
Although Vref can be trimmed by R
3
or R
4
alone, to decrease the temperature dependence of Vref it is
better to use two resistors having identical temperature coefficients. Vref can be trimmed in the range of
2.5 V ± 0.2 V. Outside this range, the bandgap circuit will not operate and the IC may shut down.
Vref
ADJ
R
1
R
2
Internal
resistors
R
3
R
4
External
resistors
R
A
=
R
1
R
3
R
1
+ R
3
R
B
=
R
2
R
4
R
2
+ R
4
Figure 5.3 Trimming of Reference Voltage
5.3 Vref Undervoltage Lockout and Overvoltage Protection
The undervoltage lockout (UVL) function turns off PWM pulse output when the input voltage (V
IN
) is low.
In these ICs, this is done by monitoring the Vref voltage, which normally stays constant at approximately
2.5 V. The UVL circuit operates with hysteresis: it shuts PWM output off when Vref falls below 1.7 V,
and turns PWM output back on when Vref rises above 2.0 V. Undervoltage lockout also provides
protection in the event that Vref is shorted to ground.
The overvoltage protection circuit shuts PWM output off when Vref goes above 6.8 V. This provides
protection in case the Vref pin is shorted to V
IN
!
PWM
output
off
PWM output on
PWM output off
1.7 2.0
2.5
5.0
6.8
Vref
PWM
output
(V)
10
Figure 5.4 Vref Undervoltage Lockout and Overvoltage Protection
UVL Voltage
Vref (V typ)
V
IN
(V typ)
3.6 V
Description
V
H
V
L
2.0 V
V
IN
increasing: UVL releases; PWM output starts
V
IN
decreasing: undervoltage lockout; PWM output stops
1.7 V
3.3 V
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| HA16114FP | RADIATION HARDENED HIGH EFFICIENCY, 5 AMP SWITCHING REGULATORS |
| HA16114P | RADIATION HARDENED HIGH EFFICIENCY, 5 AMP SWITCHING REGULATORS |
| HA16120FP | RADIATION HARDENED HIGH EFFICIENCY, 5 AMP SWITCHING REGULATORS |
| HA16114PJ | RADIATION HARDENED HIGH EFFICIENCY, 5 AMP SWITCHING REGULATORS |
| HA16120FPJ | CAP 1000PF 25V 5% NP0(C0G) SMD-0603 TR-7 PLATED-NI/SN |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| HA16114P | 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:Switching Regulator for Chopper Type DC/DC Converter |
| HA16114P/PJ/FP/FPJ/ | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:HA16114P/PJ/FP/FPJ/ HA16120FP/FPJ Datasheet 504K/SEP.18.03 |
| HA16114P-E | 制造商:Renesas Electronics Corporation 功能描述:Power Sup,SW Reg.Control IC,S-Down,DIP16 |
| HA16114PJ | 制造商:HITACHI 制造商全稱:Hitachi Semiconductor 功能描述:Switching Regulator for Chopper Type DC/DC Converter |
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