CS5207A-1 Ver la hoja de datos (PDF) - Cherry semiconductor
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CS5207A-1 Datasheet PDF : 7 Pages
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Typical Performance Characteristics: continued
1.25
1.00
0.75
0.50
0.25
0.00
0.0
1.0
2.0
3.0
4.0
5.0
Output Current (A)
Dropout Voltage vs. Output Current
6.0
7.0
20.0
18.0
16.0
14.0
12.0
10.0
8.0
6.0
4.0
2.0
0.0
0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5
VIN-VOUT (V)
Short Circuit Current vs. VIN - VOUT
1.00
0.98
0.96
0.94
0.92
0.90
TCASE = 23°C
0.88
0.86
0.84
0.82
0.80
1.00
TCASE = 0°C
2.00
3.00
VIN – VOUT (V)
Minimum Load Current vs. VIN - VOUT
TCASE = 125°C
4.00
5.00
90.0
80.0
70.0
60.0
50.0
40.0
30.0
20.0
10.0
101
VIN - VOUT = 2V
VRipple = 1VPP
IOUT = 4A
CAdj = 0.1mF
COUT = 22mF
102
103
104
Frequency (Hz)
Ripple Rejection vs. Frequency
105
106
Application Notes
Theory of Operation
The CS5207A-1 linear regulator has a composite PNP-NPN
output stage that requires an output capacitor for stability.
A detailed procedure for selecting this capacitor is includ-
ed in the Stability Considerations section.
Adjustable Operation
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 ´
R1 + R2
R1
+ R2 ´ IAdj
Design Guidelines
This LDO adjustable regulator has an output voltage range
of 1.25V to 5V. An external resistor divider sets the output
voltage as shown in Figure 1. The regulatorÕs voltage sens-
ing error amplifier maintains a fixed 1.25V reference
between the output pin and the adjust pin.
A resistor divider network R1 and R2 causes a fixed current
to flow to ground. This current creates a voltage across R2
The term IAdj ´ R2 represents the error added by the adjust
pin current.
R1 is chosen so that the minimum load current is a least
10mA. R1 and R2 should be of the same composition for
best tracking over temperature. For best results, the divider
resistor should be placed near the regulator with a separate
metal trace connecting them to output.
4
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