TPIC6A259

POWER LOGIC 8BIT ADDRESSABLE LATCH

SLIS004B − APRIL 1993 − REVISED SEPTEMBER 1995

7

POST OFFICE BOX 655303

POST OFFICE BOX 1443

PARAMETER MEASUREMENT INFORMATION

OUTPUT CURRENT

vs

TIME FOR INCREASING LOAD RESISTANCE

Region 1

Region 2

First output current pulses after turn-on in chopping mode

with resistive load.

0

0.75

1.5

0

Time

Time

IOK

(see Notes A

and B)

REGION 1 CURRENT WAVEFORM

IOK

1.25

1

0.5

0.25

NOTES: A. Figure 3 illustrates the output current characteristics of the device energizing a load having initially low, increasing resistance, e.g.,

an incandescent lamp. In region 1, chopping occurs and the peak current is limited to IOK. In region 2, output current is continuous.

The same characteristics occur in reverse order when the device energizes a load having an initially high, decreasing resistance.

B. Region 1 duty cycle is approximately 2%.

Figure 3. Chopping-Mode Characteristics

0.9

0.6

0.3

0

− 50

− 25

0

25

50

75

1.2

OUTPUT CURRENT LIMIT

vs

CASE TEMPERATURE

100

TC − Case Temperature − °C

1.5

125

150

VCC = 5.5 V

VCC = 4.5 V

Figure 4