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L6566B View Datasheet(PDF) - STMicroelectronics

Part Name
Description
MFG CO.
L6566B
ST-Microelectronics
STMicroelectronics ST-Microelectronics
'L6566B' PDF : 51 Pages View PDF
L6566B
Application information
Table 6. L6566B protections (continued)
Protection
Description
Caused by
IC
behavior
Vcc
restart
IC Iq
VREF
(V) (mA) (V)
SS
VCOMP OSC
FMOD VFF
(V)
(V)
Shutdown2
Shutdown
by VCOMP
low
VCOMP <
VCOMPOFF
Latched
10 0.33 0
0
Shutdown Vcc < 9.4V
by Vcc going (VCOMP >
ADAPTIVE
UVLO
below Vccoff
(lowering of
Vccoff
threshold at
VCOMPL)
Vcc < 7.2V
(VCOMP >
Auto
restart
5V
0.18
mA
0
0
light load) VCOMPO)
0
0
0
0
0
0
0
0
1. Use One external diode from VFF (#15) to AC_OK (#16), cathode to AC_OK
2. Use one external diode from SS (#14) to VREF (#10), cathode to VREF
3. If Css and the Vcc capacitor are such that Vcc falls below UVLO before latch tripping (Figure 21 on page 34)
4. If Css and the Vcc capacitor are such that the latch is tripped before Vcc falls below UVLO (Figure 21 on page 34)
5. When TJ < 110 oC
6. Discharged to zero by Vcc going below UVLO
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. Optionally, a restart can be forced by pulling the voltage of pin 16 (AC_OK) below
0.45 V.
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