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ISL97671A Datasheet(PDF) 16 Page - Renesas Technology Corp |
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ISL97671A Datasheet(HTML) 16 Page - Renesas Technology Corp |
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16 / 28 page  ISL97671A FN7709 Rev.4.00 Page 16 of 28 Sep 14, 2017 TABLE 2. PROTECTIONS TABLE CASE FAILURE MODE DETECTION MODE FAILED CHANNEL ACTION GOOD CHANNELS ACTION VOUT REGULATED BY 1 CHx Short-Circuit Upper Over-Temperature Protection limit (OTP) not triggered and CHx < 7.5V CHx ON and burns power. Remaining channels normal Highest VF of all channels 2 CHx Short-Circuit Upper OTP triggered but CHx < 7.5V All channels turn off until chip cooled, then turn back on with current reduced to 76%. Subsequent OTP triggers will reduce IOUT further. Same as CHx Highest VF of remaining channels 3 CHx Short-Circuit Upper OTP not triggered but CHx > 7.5V CHx disabled after 6 PWM cycle time-outs. Remaining channels normal Highest VF of remaining channels 4 CHx Open Circuit with infinite resistance Upper OTP not triggered and CHx < 7.5V VOUT will ramp to OVP. CHx will time- out after 6 PWM cycles and switch off. VOUT will drop to normal level. Remaining channels normal Highest VF of remaining channels 5CHx LED Open Circuit but has paralleled Zener Upper OTP not triggered and CHx < 7.5V CHx remains ON and has highest VF, thus VOUT increases. Remaining channels ON, remaining channel FETs burn power VF of CHX 6CHx LED Open Circuit but has paralleled Zener Upper OTP triggered but CHx < 7.5V All channels turn off until chip cooled, then turn back on with current reduced to 76%. Subsequent OTP triggers will reduce IOUT further. Same as CHx VF of CHx 7CHx LED Open Circuit but has paralleled Zener Upper OTP not triggered but CHx > 7.5V CHx remains ON and has highest VF, thus VOUT increases. VOUT increases, then CH-X switches OFF after 6 PWM cycles. This is an unwanted shut off and can be prevented by setting OVP at an appropriate level. VF of CHx 8 Channel-to-Channel VF too high Lower OTP triggered but CHx < 7.5V Any channel below the target current will fault out after 6 PWM cycles. Remaining channels driven with normal current. Highest VF of remaining channels 9 Channel-to-Channel VF too high Upper OTP triggered but CHx < 7.5V All channels go off until chip cools and then come back on with current reduced to 76%. Subsequent OTP triggers will reduce IOUT further. Boost switch OFF 10 Output LED stack voltage too high VOUT > VOVP Any channel that is below the target current will time-out after 6 PWM cycles, and VOUT will return to the normal regulation voltage required for other channels. Highest VF of remaining channels 11 VOUT/LX shorted to GND at start-up or VOUT shorted in operation LX current and timing are monitored. OVP pins monitored for excursions below 20% of OVP threshold. The chip is permanently shutdown 31ms after power-up if VOUT/Lx is shorted to GND. |
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