ZXCT1008FTA View Datasheet(PDF) - Diodes Incorporated.

Part Name

Description

Manufacturer

ZXCT1008FTA

INCREASED AMBIENT TEMPERATURE HIGH-SIDE CURRENT MONITOR

Diodes Incorporated. 

Typical Characteristics (Continued)

ZXCT1008

Power Dissipation

The maximum allowable power dissipation of the device for normal

operation (PMAX), is a function of the package junction to ambient thermal

resistance (θJA), maximum junction temperature (TJMAX), and ambient

temperature (TAMB), according to the expression:

Application Information

The following text describes how to scale a load current to an

output voltage.

PMAX = (TJMAX – TAMB) / θJA

The device power dissipation, PD is given by the expression:

PD = IOUT x (VIN -VOUT) W

Figure 1. Generic ZXCT1008 Configuration

VSENSE = VIN - VLOAD = ILOAD x RSENSE

(1)

VOUT = IOUT x ROUT = 0.01 x VSENSE x ROUT

(2)

E.G.

A 1A current is to be represented by a 100mV output voltage:

1) Choose a value of RSENSE to that at full load:

50mV > VSENSE > 500mV.

For example, choose VSENSE = 100mV at 1.0A.

From (1) RSENSE = VSENSE/ILOAD = 0.1/1.0 = 0.1Ω.

2) Choose ROUT to give VOUT = 100mV @ VSENSE = 100mV

Rearranging (2) for ROUT gives:

ROUT = VOUT/(VSENSE x 0.01)

= 0.1 / (0.1 x 0.01) = 100Ω

ZXCT1008

Document number: DS33440 Rev.8 - 2

4 of 8

www.diodes.com

December 2017

© Diodes Incorporated

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