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S-8333CBHA-T8T1y Datasheet(PDF) 12 Page - Seiko Instruments Inc

No. de pieza S-8333CBHA-T8T1y
Descripción Electrónicos  STEP-UP, FOR LCD BIAS SUPPLY, 1-CHANNEL, PWM CONTROL SWITCHING REGULATOR CONTROLLER
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Fabricante Electrónico  SII [Seiko Instruments Inc]
Página de inicio  http://www.sii.co.jp
Logo SII - Seiko Instruments Inc

S-8333CBHA-T8T1y Datasheet(HTML) 12 Page - Seiko Instruments Inc

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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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