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STA530 Fiches technique(PDF) 9 Page - STMicroelectronics |
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STA530 Fiches technique(HTML) 9 Page - STMicroelectronics |
9 / 17 page 9/17 STA530 In fig. 2 there is the power protection strategy pic- tures. Under the curve of the 18W power, the chip is in normal operation, over 30W the chip is forced in Standby. This last status would be reached if the Buck regulator does not respond quikly enough re- ducing the stress to less than 30W. The fig.3 gives the protection current, Iprot(PD), be- havior. The current sourced by the pin Prot follows the formula: (for each channel) for Pd < Pd_av_th the Iprot(PD)= 0. Figure 2. Power protection threshold Figure 3. Protection current behaviour Iprot (PD) CURRENT PROTECTION The chip is also protected by a current detection. The current ILOAD is compared with the reference current ILIMP, if bigger (ILOAD> 4,5 A)a current Ip- rot(IL), is supplied to the Protection pin. As further protection, when ILOAD reaches an higher threshold (5 A) the chip is shut down, forcing low the Stby/Mute pin, and the turn on sequence is restarted. The above description is relative for each channel in 4x30W configuration. The fig.4 gives the protection current, Iprot(IL), be- havior. The current sourced by the pin Prot follows the formula: (for each channel) for IlLOAD < Iict,s the Iprot(IL) = 0. For the parallel channel Iprot is double. The chip is also shut down in the following conditions: 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 junc- tion temperature reaches 130°C. Figure 4. Protection current behaviour Iprot (IL) I prot P D () P d P d_ av _th ) – ( 510 4 – ⋅⋅ 1.25 V ------------------------------------------------------------------- ≡ 7.5 0 3.5 3.0 2.5 2.0 1.5 1.0 5.0 4.0 4.5 15.0 22.5 30.0 37.5 Vds(V) Ids(A) D02AU1366 Ilim=4.5A Pd_Max=30W Standby Normal Operation Pd_reg=18W m ita tion 10 510 15 20 25 Pd (W) Iprot (IPd) (mA) 20 30 Iprot slope = 0.4 mA/W : I prot IL () I LO AD I ict s , ) – ( 2500 ---------------------------------------- ≡ 1 800 400 2345 6 Id(A) Iprot(IL)( µA) D02AU1367 Iprot slope=400 µA/A 4.5A 5A |
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