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Teilenummer | PQ30RV21 |
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Beschreibung | Variable Output Low Power-Loss Voltage Regulators | |
Hersteller | Sharp | |
Logo | ||
Gesamt 8 Seiten Low Power-Loss Voltage Regulators
PQ30RV1/PQ30RV11/PQ30RV2/PQ30RV21
PQ30RV1/PQ30RV11/PQ30RV2/PQ30RV21
Variable Output Low Power-Loss Voltage Regulators
s Features
¡Compact resin full-mold package
¡Low power-loss (Dropout voltage : MAX.0.5V)
¡Variable output voltage (setting range : 1.5 to 30V)
¡Built-in output ON/OFF control function
s Applications
¡Power supply for print concentration control of electronic
typewriters with display
¡Series power supply for motor drives
¡Series power supply for VCRs and TVs
s Outline Dimensions
10.2MAX
PQ30RV31 φ3.2±0.1
4-1.4
+0.3
-0
4-0.6
+0.2
-0.1
3-(2.54)
(Unit : mm)
4.5±0.2
2.8±0.2
(1.5)
(0.5)
s Model Line-ups
Output voltage
Reference voltage
precision : ±4%
1A output
PQ30RV1
Reference voltage
precision : ±2%
PQ30RV11
2A output
PQ30RV2
PQ30RV21
s Equivalent Circuit Diagram
1
2
1q 2q 3q 4q
Internal connection diagram
12
Specific IC
3
4
1 DC input (VIN)
2 DC output (VO)
3 GND
4 Output voltage
minute
adjustment
terminal (VADJ)
Reference
voltage
generation
circuit
*ASO
protection
circuit
-4
+
Overheat
protection
circuit
3
*ASO:Area of Safety
Operation
· Please refer to the chapter“ Handling Precautions ”.
“ In the absence of confirmation by device specification sheets,SHARP takes no responsibility for any defects that may occur in equipment using any SHARP devices
shown in catalogs,data books,etc.Contact SHARP in order to obtain the latest version of the device specification sheets before using any SHARP's device. ”
Low Power-Loss Voltage Regulators
Fig.21 Output Peak Current vs. Junction
Temperature (PQ30RV2/PQ30RV21)
5
PQ30RV1/PQ30RV11/PQ30RV2/PQ30RV21
4 VIN-VO=5V
2V
3 0.5V
IOP:Output current when output voltage
is 95% in comparison with the initial value
2 R1=390Ω,R2=2.7kΩ
-20 0 25 50 75
100
Junction temperature Tj (˚C)
125
s Standard Connection
D1
VIN 1q 2q
VO
+
R2
CIN
3q
4q
R1
Cref
390Ω
to10kΩ
+
CO
D1 : This device is necessary to protect the element from damage when reverse voltage may be applied to the regulator in case of
input short-circuiting.
Cref : This device is necessary when it is required to enhance the ripple rejection or to delay the output start-up time(*1).
(*1)Otherwise, it is not necessary.
(Care must be taken since Cref may raise the gain, facilitating oscillation.)
(*1)The output start-up time is proportional to Cre fX R2.
CIN, CO : Be sure to mount the devices CIN and CO as close to the device terminal as possible so as to prevent oscillation.
The standard specification of CIN and CO is 0.33µF and 47µF, respectively. However, ajust them as necessary after checking.
R1, R2 : These devices are necessary to set the output voltage. The output voltage VO is given by the following formula:
VO=Vref X (1+R2/R1)
(Vref is 1.25V TYP)
The standard value of R1 is 390Ω.But value up 10kΩdoes not cause any trouble.
6 Page | ||
Seiten | Gesamt 8 Seiten | |
PDF Download | [ PQ30RV21 Schematic.PDF ] |
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