78TXXA

LINEAR INTEGRATED CIRCUIT

UNISONICTECHNOLOGIESCO.,LTD

6 of 8

www.unisonic.com.tw

QW-R101-011.R



ELECTRICAL CHARACTERISTICS (Cont.)

For 78T18A

(VIN =27V, IOUT =0.5A)

PARAMETER

SYMBOL

TEST CONDITIONS

MIN

TYP MAX

UNIT

Output Voltage

VOUT

IOUT=5mA~1.0A

17.28 18.0 18.72

V

VIN =21~33V, IOUT=5mA~1.0A

17.1

18.9

V

Load Regulation

VOUT

IOUT=5mA~1.0A

180

mV

IOUT=0.25A~0.75A

90

mV

Line Regulation

VOUT

VIN =21~33V

180

mV

VIN =21~33V, IOUT =1.0A

180

mV

Quiescent Current

IQ

IOUT≤1.0A

8.0

mA

Quiescent Current Change

IQ

VIN =21.5~33V

1.0

mA

IOUT=5mA~1.0A

0.5

mA

Output Noise Voltage

eN

10Hz≤f≤100kHz

110

μV

Ripple Rejection

RR

VIN =22~32V,f=120Hz

50

69

dB

Peak Output Current

IPEAK

1.8

A

Short-Circuit Current

ISC

VIN =35V

250

mA

Dropout Voltage

VD

2.0

V

For 78T24A

(VIN=33V, IOUT =0.5A)

PARAMETER

SYMBOL

TEST CONDITIONS

MIN

TYP MAX

UNIT

Output Voltage

VOUT

IOUT=5mA~1.0A

23.04 24.0 24.96

V

VIN =27~35V, IOUT=5mA~1.0A

22.8

25.2

V

Load Regulation

VOUT

IOUT=5mA~1.0A

240

mV

IOUT=0.25A~0.75A

120

mV

Line Regulation

VOUT

VIN =27~35V

240

mV

VIN =27~35V, IOUT =1.0A

240

mV

Quiescent Current

IQ

IOUT≤1.0A

8.0

mA

Quiescent Current Change

IQ

VIN =28~35V

1.0

mA

IOUT=5mA~1.0A

0.5

mA

Output Noise Voltage

eN

10Hz≤f≤100kHz

170

μV

Ripple Rejection

RR

VIN =28~35V,f=120Hz

47

66

dB

Peak Output Current

IPEAK

1.8

A

Short-Circuit Current

ISC

VIN=35V

250

mA

Dropout Voltage

VD

2.0

V

Note 1: The Maximum steady state usable output current are dependent on input voltage, heat sinking, lead length

of the package and copper pattern of PCB. The data above represents pulse test conditions with junction

temperatures specified at the initiation of test.

Note 2: Power dissipation<0.5W