L99DZ320 datasheet(10/146 Pages) STMICROELECTRONICS

10 / 146 page

2.3.1

LQFP64 thermal data

Devices belonging to the L99DZxxx family embed a multitude of junctions (that is outputs based on a Power

MOSFET stage) housed in a relatively small piece of silicon. The L99DZ320 contains, among all the described

features, 3 half-bridges (6 N-channel Power MOSFET), 9 high-sides and two voltage regulators.

For this reason, using the thermal impedance of a single junction (that is voltage regulator or major power

dissipation contributor) does not allow to predict thermal behavior of the whole device and therefore it is not

possible to assess if a device is thermally suitable for a given activation profile and loads characteristics.

Some representative and realistic worst case thermal profiles are described in the below paragraph. The following

measurement methods can be easily implemented, by the final user, for a specific activation profile.

2.3.2

L99DZ320 thermal profiles

Profile 1

Battery voltage: 16 V, ambient temperature start: 85°C

DC activation:

V1 charged with 80 mA (62 Ω - DC activation)

V2 charged with 30 mA (150 Ω - DC activation)

HS7: 150 Ω resistor (DC activation)

HS8: 330 Ω resistor (DC activation)

HS11: 470 Ω resistor (DC activation)

HS12: 470 Ω resistor (DC activation)

HS13: 470 Ω resistor (DC activation)

HS14: 470 Ω resistor (DC activation)

Cyclic activation

•

HB4–HB5: 4.8 Ω (3.3 + 1.5) resistor placed across those outputs 10 activations of lock/unlock (200 ms ON

lock; 2500 ms wait; 200 ms ON unlock; 2500 ms wait)

•

HB5–HB6: 10 Ω resistor placed across those outputs 10 activations of safe lock/unlock (200 ms ON lock;

2500 ms wait; 200 ms ON unlock; 2500 ms wait)

Test execution:

Once thermal equilibrium is reached with all DC load active, the “cyclic activation” sequence is applied.

The device operates always without triggering the thermal warning threshold.

Profile 2

Battery voltage: 16 V, ambient temperature start: 85°C

DC activation:

V1 charged with 100 mA (50 Ω - DC activation)

V2 charged with 30 mA (150 Ω - DC activation)

HS7: 150 Ω resistor (DC activation)

HS8: 330 Ω resistor (DC activation)

HS11: 470 Ω resistor (DC activation)

HS12: 470 Ω resistor (DC activation)

HS13: 470 Ω resistor (DC activation)

HS14: 470 Ω resistor (DC activation)

Cyclic activation

•

Windows lift: real motor placed across external MOS 2 activations up/down. (5 s up; 5 s down)

Test execution:

Once thermal equilibrium is reached with all DC load active, the “cyclic activation” sequence is applied.

The device operates always without triggering the thermal warning threshold.

L99DZ320

Electrical specifications

DS14235 - Rev 5

page 10/146

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