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STA550 Scheda tecnica(PDF) 11 Page - STMicroelectronics |
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STA550 Scheda tecnica(HTML) 11 Page - STMicroelectronics |
11 / 16 page 11/16 STA550 Figure 4. Power Protection Block Diagram In fig. 4 there is the power protection strategy pictures. Under the curve of the 25W power, the chip is in normal operation, over 48W the chip is forced in Standby. This last status would be reached if the digital converter does not respond quikly enough reducing the stress to less than 48W. The fig.5 gives the protection current, Iprot, behavior. The current sourced by the pin Prot follows the formula: for Pd < Pd_av_th the Iprot = 0 Independently of the output voltage, the chip is also shut down in the folowing conditions: When the currentthrough the sensing resistor, Rsense, reaches 6A (Voltage drop (CD+) - (CD+1) = 700mV). When the average junction temperature of the chip reaches 150°C. When the ground potential differ from more than 5V from the half of the power supply voltage, ((CD+)-(CD-))/2 When the sum of the supply voltage |Vs+| + |Vs-| <20V The output bridge is muted when the average junction temperature reaches 130°C. X V/I ILOAD I_PD RSENSE MULTIPLIER ILIM CURRENT COMP CURRENT COMP OC1 PDP1 IPROT TO TURN-ON/OFF SEQUENCE TO TURN-ON/OFF SEQUENCE TO PROT PAD D01AU1266 IPDP IPDA IPD IPD V/I OPA OUT1- OUT1+ OPA CD- CD+ CD+1 I pr ot P d P d_av _th ) – ( 510 4 – ⋅⋅ 1.25V ------------------------------------------------------------------ ≡ |
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