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CS5201-1GDPR3 Scheda tecnica(PDF) 4 Page - Cherry Semiconductor Corporation

Il numero della parte CS5201-1GDPR3
Spiegazioni elettronici  1A Adjustable Linear Regulator
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Produttore elettronici  CHERRY [Cherry Semiconductor Corporation]
Homepage  http://www.cherrycorp.com/
Logo CHERRY - Cherry Semiconductor Corporation

CS5201-1GDPR3 Scheda tecnica(HTML) 4 Page - Cherry Semiconductor Corporation

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Applications Information
The CS5201-1 linear regulator provides adjustable volt-
ages at currents up to 1A. The regulator is protected
against overcurrent conditions and includes thermal
shutdown.
The CS5201-1 has a composite PNP-NPN output transistor
and requires an output capacitor for stability. A detailed
procedure for selecting this capacitor is included in the
Stability Considerations section.
The CS5201-1 has an output voltage range of 1.25V to 5.5V.
An external resistor divider sets the output voltage as
shown in Figure 1. The regulator maintains a fixed 1.25V
(typical) reference between the output pin and the adjust
pin.
A resistor divider network R1 and R2 causes a fixed cur-
rent to flow to ground. This current creates a voltage
across R2 that adds to the 1.25V across R1 and sets the
overall output voltage. The adjust pin current (typically
50µA) also flows through R2 and adds a small error that
should be taken into account if precise adjustment of VOUT
is necessary.
The output voltage is set according to the formula:
VOUT = VREF ´
() + IAdj ´ R2
The term IAdj ´ R2 represents the error added by the adjust
pin current.
R1 is chosen so that the minimum load current is at least
2mA. R1 and R2 should be the same type, e.g. metal film
for best tracking over temperature. While not required, a
bypass capacitor from the adjust pin to ground will
improve ripple rejection and transient response. A 0.1µF
tantalum capacitor is recommended for Òfirst cutÓ design.
Type and value may be varied to obtain optimum perfor-
mance vs. price.
R1 + R2
R1
Adjustable Operation
020
30
40
50
60
40.0
Temperature (
°C)
80
45.0
50.0
55.0
60.0
65.0
70.0
90
100
10
70
110 120 130
IO = 10mA
Adjust Pin Current vs. Temperature
15
101
Frequency (Hz)
25
35
45
55
65
75
85
102
103
104
105
106
TCASE = 25°C
IOUT = 1A
(VIN Ð VOUT) = 3V
VRIPPLE = 1.0VPP
CAdj = 0.1mF
Ripple Rejection vs. Frequency
02
3
4
5
6
500
7
-100
0
100
200
Time
mS
10
9
8
1
1000
-200
0
VOUT = 3.3V
COUT= CIN = 22mF Tantalum
CAdj= 0.1mF
Transient Response
Typical Performance Characteristics: continued
1.5
2.5
3.0
3.5
1.5
VIN - VOUT (V)
1.7
1.9
2.1
2.3
3.1
3.3
1.0
4.0
2.5
2.7
2.9
3.5
2.0
Short Circuit Current vs. VIN - VOUT


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