L6382D5TR データシートの表示（PDF） - STMicroelectronics

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L6382D5TR

Power management unit for microcontrolled ballast

STMicroelectronics 

L6382D5

6

Block description

Block description

6.1

Supply section

● µPUVLO ( Power Under Voltage Lock Out): This block controls the power

management of the L6382D5 ensuring the right current consumption in each operating

state, the correct VREF current capability, the driver enabling and the high-voltage start-

up generator switching.

During Start-up the device sinks the current necessary to charge the external capacitor

on pin VCC from the high voltage bus; in this state the other IC's functions are disabled

and the current consumption of the whole IC is less than 150µA.

When the voltage on VCC pin reaches VccON, the IC enters the save mode where the

µPUVLO block controls Vcc between VccON and VccSM by switching ON/OFF the

high voltage start-up generator.

● HVSU (High-Voltage Start-Up generator): a 600V internal MOS transistor structure

controls the Vcc supply voltage during START UP and SAVE MODE conditions and it

reduces the power losses during operating MODE by switching off the MOS transistor.

The transistor has a source current capability of up to 30mA.

● TPR (Two Point Regulator) & PWS: during operating mode, the TPR block controls

the PSW switch in order to regulate the IC supply voltage (VCC) to a value in the range

between TPR(ON) and TPR(OFF) by switching ON and OFF the PSW transistor.

– Vcc > TPRst: the PSW is switched ON immediately;

– TPR(ON) < Vcc < TPRst: the PSW is switched ON at the following falling edge of

LGI;

– Vcc < TPR(OFF): the PSW is switched OFF at the following falling edge on LGI.

When the PSW switch is OFF, the diodes build a charge pump structure so that, connecting

the TPR pin to a switching voltage (through a capacitor) it is possible to supply the low

voltage section of the chip without adding any further external component. The diodes and

the switch are designed to withstand a peak current of at least 200mARMS.

6.2

5V reference voltage

This block is used to supply the microcontroller; this source is able to supply 10mA in save

mode and 30mA in normal mode; moreover, during start-up when VREF is not yet available,

an additional circuit is ensures that, even sinking 3mA, the pin voltage doesn't exceed 1.2V.

The reference is available until Vcc is above VREF(OFF); below that it turns off and the

additional sinking circuit is enabled again.

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