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L6382D5TR View Datasheet(PDF) - STMicroelectronics

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L6382D5TR Datasheet PDF : 21 Pages
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L6382D5
5
Application information
Application information
5.1
Power management
The L6382D5 has two stable states (save mode and operating mode) and two additional
states that manage the Start-up and fault conditions: the Over Current Protection is a
parallel asynchronous process enabled when in operating mode Figure 4.
Following paragraphs will describe each mode and the condition necessary to shift between
them.
Figure 4. State diagram
START-UP
VCC<VREF(OFF)
VCC>VCC(ON)
VCC<VREF(OFF)
SAVE MODE
VCC<VCC(ON)
SHUT DOWN
VREF>4.6V
&
TDE>10µs
LGI low
for more
than 100µs
OPERATING
MODE
VCC < VCC(OFF)
or
VREF<3.2V
5.2
START-UP mode
With reference to the timing diagram of figure 6, when power is first applied to the converter,
the voltage on the bulk capacitor (Vin) builds up and the HV generator is enabled to operate
drawing about 10mA. This current, diminished by the IC consumption (less than 150µA),
charges the bypass capacitor connected between pin Vcc and ground and makes its voltage
rise almost linear.
During this phase, all IC's functions are disabled except for:
the current sinking circuit on VREF pin that maintains low the voltage by keeping
disabled the microcontroller connected to this pin;
the High-Voltage Start-Up (HVSU) that is ON (conductive) to charge the external
capacitor on pin Vcc.
As the Vcc voltage reaches the start-up threshold (14V typ.) the chip starts operating and
the HV generator is switched off.
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