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參數(shù)資料
| 型號： | HA17431UA |
| 廠商： | Hitachi,Ltd. |
| 英文描述： | Regarding the change of names mentioned in the document, such as Hitachi Electric and Hitachi XX, to Renesas Technology Corp. |
| 中文描述： | 關(guān)于在諸如日立電器和日立二十，文件提及的瑞薩科技公司名稱變更 |
| 文件頁數(shù)： | 17/26頁 |
| 文件大?。?/td> | 236K |
| 代理商： | HA17431UA |
HA17431 Series
Rev.1, Sep. 2002, page 15 of 24
Application Hints
(cont.)
No.
Application Example
Description
3
Single power supply inverting
comparator circuit
K
Vout
GND
Vin
GND
A
REF
V
CC
R
L
Rin
This is an inverting type comparator with an input
threshold voltage of approximately 2.5 V. Rin is the
REF pin protection resistance, with a value of several
k
to several tens of k
.
R
is the load resistance, selected so that the cathode
current I
K
1 mA when Vout is low.
Condition
C1
C2
2.5 V or more
Approx. 2 V (V
OL
)
Vin
Less then 2.5 V
Vout
V
CC
(V
OH
)
IC
OFF
ON
4
AC amplifier circuit
GND
K
Vout
Vin
REF
A
V
CC
R
L
R
1
R
2
R
3
Cin
Cf
Gain G =
(DC gain)
R
1
R
2
// R
3
Cutoff frequency fc =
1
2
π
Cf (R
1
// R
2
// R
3
)
This is an AC amplifier with voltage gain G =
–
R
/
(R
//R
). The input is cut by capacitance Cin, so that
the REF pin is driven by the AC input signal, centered
on 2.5 V
DC
.
R
also functions as a resistance that determines the
DC cathode potential when there is no input, but if the
input level is low and there is no risk of Vout clipping to
V
CC
, this can be omitted.
To change the frequency characteristic, Cf should be
connected as indicated by the dotted line.
5
Switching power supply error
amplification circuit
+
–
V+
V
–
R
1
R
2
R
3
R
4
LED
Cf
Secondary
side GND
(Note)
Note: LED
R3
R4
: Light emitting diode in photocoupler
: Bypass resistor to feed IK(>Imin)
when LED current vanishes
: LED protection resistance
This circuit performs control on the secondary side of a
transformer, and is often used with a switching power
supply that employs a photocoupler for offlining.
The output voltage (between V+ and V
–
) is given by the
following formula:
Vout
2.5 V
×
(R
1
+ R
2
)
R
2
In this circuit, the gain with respect to the Vout error is
as follows:
G =
×
R
2
(R
1
+ R
2
)
HA17431 open
loop gain
×
photocoupler
total gain
As stated earlier, the HA17431 open-loop gain is 50 to
60 dB.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| HA17431UPA | Regarding the change of names mentioned in the document, such as Hitachi Electric and Hitachi XX, to Renesas Technology Corp. |
| HA17431VUP | Infrared Temperature Sensor; Sensor Output Type:K thermocouple; Field of View:10:1; Sensor Terminals:Cable; Accuracy: 1%; Features:Miniature Sensing Head with separate electronics; Response Time:200ms; Supply Voltage:24VDC |
| HA17431H | Shunt Regulator |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| HA17431UA-E | 制造商:Renesas Electronics Corporation 功能描述:HA17431UA-E |
| HA17431UA-TL | 制造商:Hitachi 功能描述:Voltage Regulator, Adjustable, +2.5 TO +40V, Bi-Polar, 3 Pin, Plastic, TO-243 |
| HA17431UA-TL-E | 制造商:Renesas Electronics 功能描述:Precision Cut Tape 制造商:Renesas Electronics Corporation 功能描述:Shunt Regulator,2.495V 2.2%,150mA,UPAKV 制造商:Renesas 功能描述:V-Ref Adjustable 150mA 4-Pin(3+Tab) UPAKV |
| HA17431UPA | 制造商:HITACHI 制造商全稱:Hitachi Semiconductor 功能描述:Regarding the change of names mentioned in the document, such as Hitachi Electric and Hitachi XX, to Renesas Technology Corp. |
| HA17431VLP | 制造商:HITACHI 制造商全稱:Hitachi Semiconductor 功能描述:Regarding the change of names mentioned in the document, such as Hitachi Electric and Hitachi XX, to Renesas Technology Corp. |
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