Datasheet

LV5026MC
No.A2042-11/16
Description of operation
protection function
tilte outline monitor point note
1 UVLO Under voltage lock out V
CC
voltage
2 OCP Over current protection CS voltage available FET current
3 OVP Over voltage protection V
CC
voltage
4 OTP
(TSD)
Over Temperature Protection
(Thermal Shut Down)
PN Junction temperature
1. UVLO (Under voltage lock out)
If V
IN
voltage is 7.3V or lower, then UVLO operates and the IC stops. When UVLO operates, the power supply current
of the IC is about 80μA or lower. If V
IN
voltage is 9V or higher, then the IC starts switching operation.
2. UVLO (Under voltage lock out)
The CS pin sense the current through the MOS FET switch and the primary side of the transformer. This provides an
additional level of protection in the event of a fault. If the voltage of the CS pin exceeds VCSOCP (1.9V typ) ( A ), the
iternal comparator will detect the event and turn off the MOSFET. The peak switch current is calculated
Io (peak) [A] = VSOCP [V]/Rsense [Ω]
The V
CC
pin is pulled down to fixed level, keeping the controller lached off.The lach reset occurs when the user
disconnects LED from VAC and lets the V
CC
falls below the V
CC
reset voltage, UVLOOFF (7.3V typ)( B ). Then
V
CC
rise UVLOON (9V typ) ( C ), restart the switching.
V
IN
voltage
V
CC
voltage
time
UVLOON
(9V typ)
UVLOOFF
(7.3V typ)
on
A
B
onoff
Outputstage
V
IN
voltage
CS
voltage
Time
Time
CSOCP (1.9V typ)
UVLOON (9V typ)
UVLOFF (7.3V typ)
AC
B
on onoff
Outputstage