L6590D View Datasheet(PDF) - STMicroelectronics

Part Name

Description

Manufacturer

L6590D

FULLY INTEGRATED POWER SUPPLY

STMicroelectronics 

L6590

Figure 34. Standby Function timing diagram

Pout

Peak

Primary

Current

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Load

regulation

Vout

STANDBY

(before filter)

small glitch

STANDBY

(filtered)

2 ms

1 ms

fsw

65 kHz

22 kHz

Brownout Protection (L6590D only)

Brownout Protection is basically a not-latched device shutdown functionality. It will typically be used to detect a

mains undervoltage (brownout). This condition may cause overheating of the primary power section due to an

excess of RMS current.

Figure 35. Brownout Protection Function internal schematic and timing diagram

HV Input bus

VON

VOFF

HV Input bus

Vcc

50 µA

BOK

+

6.4 V

-

2.5 V

VinOK

L6590D

VinOK

Vcc

PWM

Vout

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