L6382D データシートの表示（PDF） - STMicroelectronics

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L6382D

Power management unit for LED drivers

STMicroelectronics 

Block description

7

Block description

L6382D

7.1

Supply section

PUVLO (power undervoltage lockout): This block controls the power management of

the L6382D, ensuring the correct current consumption in each operating state, the correct

VREF current capability, driver enabling and high voltage startup generator switching. During

startup, 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 functions are disabled and the current

consumption of the whole IC is less than 150 A.

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

PUVLO block controls Vcc between VccON and VccSM by switching ON/OFF the high

voltage startup generator.

 HVSU (high voltage startup generator): a 600 V internal MOS transistor structure

controls the Vcc supply voltage during startup 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 30 mA.

 TPR (two point regulator) and PWS: during normal 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

Figure 11.

– 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 components. The diodes and

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

7.2

3.3 V reference voltage

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

mode and 30 mA in operating mode. Moreover, during startup when VREF is not yet

available, an additional circuit ensures that, even sinking 3 mA, the pin voltage will not

exceed 1.2 V.

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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DocID10972 Rev 8

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