L584 查看數據表（PDF） - STMicroelectronics

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L584

MULTIFUNCTION INJECTION INTERFACE

STMicroelectronics 

L584

The drive current for the two darlingtons and the

waveform time constants are all defined in turn by a

resistor between pin 9 and ground.

The recommended value for Ir is 1mA which is ob-

tained with a 1.2KΩ resistor. The darlington drive

currents are given by :

PNP : Idp = 35 Ir typ. NPN : Idn = 100 Ir typ.

The duration of the high current level (t2 in fig 4) is

set by a capacitor connected between pin 6 and

ground. This capacitor, C1 is related to the duration,

t2, by :

t2 = C1

V6th – V6sat

I6

= 12

C1

Iref

(typ.)

The discharge time constant (toff in fig 4) is set by a

capacitor C2 between pin 7 and ground and is found

from :

⋅ V7th – V7sat

toff = C2

I7

Cr

= 12

(typ)

Iref

Figure 4 : Waveforms of the Typical Application Circuit of Fig. 2.

7/13

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