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S-8333CBHC-T8T1U Datasheet(PDF) 12 Page - Seiko Instruments Inc |
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S-8333CBHC-T8T1U Datasheet(HTML) 12 Page - Seiko Instruments Inc |
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12 / 44 page  STEP-UP, FOR LCD BIAS SUPPLY, 1-CHANNEL, PWM CONTROL SWITCHING REGULATOR CONTROLLER S-8333 Series Rev.4.2_01 12 3. Timer latch short-circuit protection function This IC has a timer latch short-circuit protection circuit that stops the switching operation when the output voltage drops for a specific time due to output short-circuiting. A capacitor (CSP) that is used to set the delay time of this short-circuit protection circuit can be connected to the CSP pin. This IC operates at the maximum duty ratio if the output voltage drops due to output short-circuiting. At the maximum duty ratio, constant-current charging of CSP starts. If this status lasts for a short-circuit protection delay time and the CSP pin voltage rises above the reference voltage, the latch mode is set. Note that the latch mode is different from the shutdown status in that the switching operation is stopped but the internal circuitry operates normally. To reset the latch operation to protect the IC from short-circuiting, lower VIN than the UVLO detection voltage. The latch mode within the short-circuit protection delay time is reset by decreasing VIN to 1.0 V (Typ.) or lower. Note that the mode is not reset even if the VIN is lowered to the UVLO detection voltage (refer to Figure 9). Input voltage (VIN) Output load CSP pin voltage (VCSP) Latch mode Short-circuit status 50 ms (CSP = 0.1 μF) Normal status Short-circuit protection time Latch period Reset period Reset period Short-circuit protection time Short-circuit protection time UVLO release UVLO detection 1.0 V Reference voltage Figure 9 4. UVLO function This IC includes a UVLO (under-voltage lockout) circuit to prevent the IC from malfunctioning due to a transient status when power is applied or a momentary drop of the power supply voltage. When UVLO is in the detection state, switching is stopped and the external FET is held in the off status. Once UVLO enters the detection state, the soft-start function is reset. Note that the other internal circuits operate normally and that the status is different from the power-off status. |
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