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L99DZ120 Datasheet(PDF) 21 Page - STMicroelectronics |
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L99DZ120 Datasheet(HTML) 21 Page - STMicroelectronics |
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21 / 162 page  DocID029145 Rev 4 21/162 L99DZ120 Electrical specifications 161 3.3.1 LQFP64 thermal data Devices belonging to L99DZxxx family embed a multitude of junctions (i.e. Outputs based on a PowerMOSFET stage) housed in a relatively small piece of silicon. The most complex device contains, among all the described features, 6 half-bridges (12 N-Channel PowerMOS), 10 high-sides and two voltage regulators; all the other derivatives, even if smaller than the family super set device, still contain a significant number of junctions. For this reason, using the Thermal Impedance of a single junction (i.e. 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. Thermal information is provided as temperature reading by different clusters placed close to the most dissipative junctions. Some representative and realistic worst-case thermal profiles are described in the below paragraph. Following measurement methods can be easily implemented, by final user, for a specific activation profile. L99DZ120 thermal profiles Profile 1 Battery Voltage: 16V, Ambient temperature start: 85°C DC activation V1 charged with 70 mA (DC activation) V2 charged with 30 mA (DC activation) OUT7: 1 x10W bulb (DC activation) OUT8: 1 x 5W bulb (DC activation) OUT11: 300 Ω resistor (DC activation) OUT12: 300 Ω resistor (DC activation) OUT13: 300 Ω resistor (DC activation) OUT14: 300 Ω resistor (DC activation) Table 5. Temperature warning and thermal shutdown Symbol Parameter Min. Typ. Max. Unit TW Thermal overtemperature warning threshold Tj(1) 1. Non-overlapping. 140 150 160 °C TSD1 Thermal shutdown junction temperature 1 Tj(1) Cluster 1-4 Cluster 5-6 165 165 175 175 185 190 °C TSD2 Thermal shutdown junction temperature 2 Tj(1) 175 185 195 °C TSD12hys Hysteresis 5 °C Tjtft Thermal warning / shutdown filter time 32 µs |
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