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

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L6382D

Power management unit for LED drivers

STMicroelectronics 

Application information

6

Application information

L6382D

6.1

Power management

The L6382D has two stable states (save mode and operating mode) and two additional

states that manage the startup and fault conditions (Figure 10): the overcurrent protection is

a parallel asynchronous process enabled when in operating mode.

The following paragraphs describe each mode and the condition necessary to shift between

them.

Figure 10. State diagram

6.2

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Startup mode

With reference to the timing diagram in Figure 11, when power is first applied to the

converter, the voltage on the bulk capacitor builds up and the HV generator is enabled to

operate, drawing about 10 mA. This current, diminished by the IC consumption (less than

150 A), charges the bypass capacitor connected between pin Vcc and ground and makes

its voltage rise almost linearly.

During this phase, all IC functions are disabled except for:

 the current sinking circuit on the VREF pin maintains the voltage low by keeping the

microcontroller connected to this pin disabled;

 the high voltage startup (HVSU) that is ON (conductive) to charge the external

capacitor on pin Vcc.

12/21

DocID10972 Rev 8

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