CS52015-1GDPR3 datasheet(4/7 Pages) CHERRY

4 / 7 page

Applications Information

The CS52015-1 linear regulator provides adjustable volt-

ages at currents up to 1.5A. The regulator is protected

against overcurrent conditions and includes thermal

shutdown.

The CS52015-1 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 52015-1 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

Adjustable Operation

020

40.0

Temperature (

°C)

45.0

50.0

55.0

60.0

65.0

70.0

100

110 120 130

IO = 10mA

101

Frequency (Hz)

102

103

104

106

105

TCASE = 25°C

IOUT = 1.5A

(VIN Ð VOUT) = 3V

VRIPPLE = 1.0VPP

CAdj = 0.1mF

Adjust Pin Current vs. Temperature

Ripple Rejection vs. Frequency

750

-100

100

200

Time

1500

-200

VOUT=3.3V

COUT =CIN =22mF Tantalum

CAdj =0.1mF

Transient Response

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

4.5

5.0

6.0

5.5

6.5

7.0

Short Circuit Current vs VIN-VOUT

Typical Performance Characteristics

CS52015-1GDPR3 数据表(PDF) 4 Page - Cherry Semiconductor Corporation

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