Summary of L6591 power management functions

L6591

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1.

Use one external diode from SS (#14) to VREF (#10), cathode to VREF.

2.

The condition is latched as long as the IC is supplied; the HV generator is not invoked.

3.

All values are typical unless otherwise specified.

It is worth reminding that “auto-restart” means that the device will work intermittently as long

as the condition that is activating the function is not removed; “Latched” means that the

device is stopped as long as the unit is connected to the input power source and the unit

must be disconnected for some time from the source in order for the device (and the unit) to

restart.

Protection

Description

Caused by

IC

behavior

Vcc

restart

[V]

IC Iq

[mA]

VREF

[V]

SS

[V]

OSC

[V]

PFC_STOP

Transformer

saturation or

shorted

secondary

diode

protection

1.5 V for 2

consecutive

switching

cycles

Latched

(2)

5

0.35

max

0

0

0

Stop

Active (low)

DISABLE

Externally

programmabl

e latched

protection

4.5 V

Latched

13

0.35

max

0

0

0

Stop

Active (low)

Brownout

Mains

undervoltage

protection

1.25 V

Auto

restart

5

0.35

max

00

0

Stop

Not active

(high Z)

Table 6.

Protections (continued)