CS5205-3GDPR3 datasheet(4/7 Pages) CHERRY

4 / 7 page

The CS5205-X family of linear regulators provide fixed or

adjustable voltages at currents up to 5A. 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 CS5205-X 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 adjustable regulator (CS5205-1) has an output voltage

range of 1.25V to 13V. An external resistor divider sets the

output voltage as shown in Figure 1. The regulator main-

tains 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

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.

Figure 1. Resistor divider scheme for the adjustable version.

VOUT

VIN

CS5205-1

VIN

Adj

VOUT

VREF

IAdj

CAdj

R1 + R2

Adjustable Operation

Applications Information

Typical Performance Characteristics: continued

020

40.0

Temperature (

°C)

45.0

50.0

55.0

60.0

65.0

70.0

100

110 120 130

IO = 10mA

0.0

101

Frequency (Hz)

10.0

20.0

30.0

40.0

50.0

60.0

70.0

80.0

90.0

100.0

102

103

104

105

TCASE = 25°C

IOUT = 5A

(VIN Ð VOUT) = 3V

VRIPPLE = 1.6VPP

0.0

101

Frequency (Hz)

10.0

20.0

30.0

40.0

50.0

60.0

70.0

80.0

90.0

100.0

102

103

104

105

TCASE = 25°C

IOUT = 5A

(VIN Ð VOUT) = 3V

VRIPPLE = 1.6VPP

CAdj = 25mF

Adjust Pin Current vs. Temperature

Ripple Rejection vs. Frequency (Fixed Versions)

Ripple Rejection vs. Frequency (Adjustable Version)

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