CS5203A-5GT3 Просмотр технического описания (PDF) - Cherry semiconductor
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CS5203A-5GT3 Datasheet PDF : 8 Pages
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Typical Performance Characteristics: continued
70.0
65.0
IO = 10mA
100.0
90.0
80.0
60.0
70.0
60.0
55.0
50.0
45.0
50.0
40.0
30.0
20.0
10.0
TCASE = 25°C
IOUT = 3A
(VIN – VOUT) = 3V
VRIPPLE = 1.6VPP
40.0
0 10 20 30 40 50 60 70 80 90 100 110 120 130
Temperature (°C)
0.0
101
102
103
104
105
Frequency (Hz)
Adjust Pin Current vs. Temperature
Ripple Rejection vs. Frequency (Fixed Versions)
100.0
90.0
80.0
70.0
60.0
50.0
40.0
30.0
20.0
TCASE = 25°C
IOUT = 3A
(VIN – VOUT) = 3V
VRIPPLE = 1.6VPP
CAdj = 25µF
10.0
0.0
101
102
103
104
105
Frequency (Hz)
Ripple Rejection vs. Frequency (Adjustable Version)
Applications Information
The CS5203A family of linear regulators provides fixed or
adjustable voltages at currents up to 3A. The regulators
are protected against short circuit, and include thermal
shutdown and safe area protection (SOA) circuitry. The
SOA protection circuitry decreases the maximum avail-
able output current as the input-output differential volt-
age increases.
The CS5203A 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 output voltage is set according to the formula:
( ) VOUT = VREF × R1 + R2 + IAdj × R2
R1
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
10mA. R1 and R2 should be the same type, e.g. metal film
for best tracking over temperature. The adjust pin is
bypassed to improve the transient response and ripple
rejection of the regulator.
Adjustable Operation
The adjustable regulator (CS5203A-1) has an output volt-
age range of 1.25V to 13V. 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.
VIN
C1
VIN
VOUT
CS5203A-1
Adj
VREF
R1
IAdj
R2
CAdj
VOUT
C2
Figure 1. Resistor divider scheme for the adjustable version.
4
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