4

Output Driver Fault Sense, Low Threshold

(Short)

3

4

5.5

V

PROTECTION PARAMETERS

Over-Current Limiting

0.7

-

Note 1

A

Over-Temperature Limiting

(Junction Temperature)

-

165

-

Over-Temperature Limiting, Hysteresis

-15-

DESIGN PARAMETERS

Input Capacitance

-3-

pF

Enable Capacitance

-

4.6

-

pF

NOTES:

1. Output Transient Currents are controlled by on-chip limiting for each output. Under short-circuit conditions with voltage applied to the

collector of the output transistor and with the output transistor turned ON, the current will increase to 1.2A, typical. Over-Current Limiting

protects a short circuit condition for a normal operating range of output supply voltage. During a short circuit condition, the output driver

will shortly thereafter (approximately 5ms) go into Over-Temperature Shutdown. While Over-Current Limiting may range to peak cur-

rents as high as 1.6A, each output will typically withstand a direct short circuit at normal single battery supply levels. Excessive dissi-

pation before thermal shutdown occurs may cause damage to the chip for supply voltages greater than 16V. When sequentially

switched, the outputs are rated to withstand peak current, cold turn-on conditions of lamp loads such as #168 or #194 lamps.

icantly increase the chip temperature due to increased dissipation and may cause thermal shutdown in high ambient temperature con-

ditions (See Absolute Maximum Ratings for Dissipation). Any one output may be allowed to exceed 0.7A but may be subject to Over-

3. The PLCC and SOIC packages have power lead frame construction through the ground pins to conduct heat from the frame to the PC

Board ground area. Thermal resistance,

copper PC board with minimal ground area and with a 2 square inches of ground area.

sink is to detect open load conditions.

LOGIC TABLE for Fault Modes.

7. Tested with 120mA switched off in a Load of 70mH and 32

Ω series resistance;

8. The single pulse clamp energy rating for the CA3292A is defined over a range of operating conditions. The Clamp Energy is a function

Load Current at the instant of Turn-OFF. Refer to Figure 5 for the Safe Operating Area when driving inductive loads. Rating limits for

Energy vs Single Pulse Width Time are plotted for different coil values. Refer to Application Note - AN9416 for pulse energy calculation

methods.

Electrical Specifications

PARAMETER

SYMBOL

TEST CONDITIONS

MIN

TYP

MAX

UNITS

CA3272A, CA3292A