STOD13ASTPUR 查看數據表（PDF） - STMicroelectronics
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STOD13ASTPUR Datasheet PDF : 25 Pages
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Detailed description
STOD13AS
8.1.5
8.1.6
8.1.7
8.1.8
8.1.9
8.1.10
Enable pin
The device operates when the EN pin is set high. If the EN pin is set low, the device stops
switching, and all the internal blocks are turned off. In this condition the current drawn from
VINP/VINA is below 1 µA in the whole temperature range. In addition, the internal switches
are in an OFF state so the load is electrically disconnected from the input, this avoids
unwanted current leakage from the input to the load.
Soft-start and inrush current limiting
After the EN pin is pulled high, or after a suitable voltage is applied to VINP, VINA and EN, the
device initiates the start-up phase.
As a first step, the CMID capacitor is charged and the P1B switch implements a current
limiting technique in order to keep the charge current below 400 mA. This avoids the battery
overloading during startup.
After VMID reaches the VINP voltage level, the P1B switch is fully turned on and the soft-start
procedure for the step-up is started. After around 2 ms the soft-start for the inverting is
started. The positive and negative voltages are under regulation at around 13 ms after the
EN pin is asserted high.
Undervoltage lockout
The undervoltage lockout function avoids improper operation of the STOD13AS when the
input voltage is not high enough. When the input voltage is below the UVLO threshold the
device is in shutdown mode. The hysteresis of 50 mV avoids unstable operation when the
input voltage is close to the UVLO threshold.
Overtemperature protection
An internal temperature sensor continuously monitors the IC junction temperature. If the IC
temperature exceeds 140 °C, typical, the device stops operating. As soon as the
temperature falls below 125 °C, typical, normal operation is restored.
Short-circuit protection during soft-start (SSD)
During device soft-start on the positive output, an internal comparator checks if the panel is
damaged. In this case, soft-start is stopped and the device is parked in power-off. To reset
the normal functionality (assuming that the anomalous load condition is removed), it is
necessary to restart the converter through an enable transient.
If the panel is not damaged it is possible to proceed with the soft-start of the negative output
and both reach their final value, therefore ensuring normal output voltages and functionality.
Overload protection (OLP)
The output current is internally limited. An overload condition, as a short-circuit between the
two outputs or between each output and GND, produces the device power-off. To reset the
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Doc ID 022733 Rev 1
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