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LV5026MC
Description of operation
protection function
tilte
outline
monitor point
note
1
UVLO
Under voltage lock out
VCC voltage
2
3
4
OCP
OVP
OTP
Over current protection
Over voltage protection
Over Temperature Protection
CS voltage
VCC voltage
PN Junction temperature
available FET current
(TSD)
(Thermal Shut Down)
1. UVLO (Under voltage lock out)
If VIN 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 80 μ A or lower. If VIN voltage is 9V or higher, then the IC starts switching operation.
VIN
voltage
UVLOON
(9V typ)
UVLOOFF
(7.3V typ)
Outputstage
on
A
off
B
on
VCC
voltage
time
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 VCC 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 VCC falls below the VCC reset voltage, UVLOOFF (7.3V typ)( B ). Then
VCC rise UVLOON (9V typ) ( C ), restart the switching.
CS
voltage
CSOCP (1.9V typ)
VIN
voltage
UVLOON (9V typ)
A
B
C
Time
Outputstage
UVLOFF (7.3V typ)
Time
on
off
on
No.A2042-11/16
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