HA13408 데이터 시트보기 (PDF) - Hitachi -> Renesas Electronics

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HA13408

9-Channel Power Driver

Hitachi -> Renesas Electronics 

HA13408

Peak Current and Turn-Off Time

Figure 1 shows load current (Iout) and output terminal voltage (Vout) waveforms for the HA13408 driving an

inductive load.

Vin

Hi

Low

ton

T

IP

Iout 0

tsus

VCE(sus)

Vout VCC2

VCE(sat)

Figure 1 Output Waveforms

The peak output current (Ip) and sustain time (tsus) are obtained as follows;

IP =

VCC2 – VCE(sat)

R

R

1 – exp – L ton

=..

VCC2

R

R

1 – exp – L ton

(1)

tsus =

L

R

ln 1 +

IP • R

VCE(sus) – VCC2

(2)

Where L is load self-inductance and R is load direct current resistance.

For example, under the following conditions:

L = 5 mH,

R = 22 Ω

Supply voltage VCC2 = 24 V,

Time to drive load ton = 0.42 ms.

Peak current (Ip) and sustain time (tsus) are then:

IP = 0.87 A

3

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