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| UPS3652 Datasheet, PDF (7/9 Pages) Unisonic Technologies – HIGH PERFORMANCE CURRENT MODE POWER SWITCH | |||
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UPS3652
ï® FUNCTIONAL DESCRIPTION(Cont.)
LINEAR INTEGRATED CIRCUIT
FIG.6 OLP case
FIG.7 OVP case
500Ω/1W
VDRAIN
15V VCC
IC3
1
8
470u
33n
2
7
UPS3652
47nF3
6
4
5
VFB
5.6V
3V
0
t
TD-OLP
t
VCC
VTHD(ON)
0
t
FIG.8 OLP test circuit
500Ω/1W
15V VDD
15V
470u
VCC
IC3
1
8
33n
2
7
UPS3652
3
2.5V
6
4
5
470u 33n
Drain
VOVP
VCC
FIG.9 OVP test circuit
OTP
OTP will shut down driver when junction temperature TJ>T(THR) for continual a blanking time.
(7) Driver Output Section
The driver-stage drives the gate of the MOSFET and is optimized to minimize EMI and to provide high circuit
efficiency. This is done by reducing the switch on slope when reaching the MOSFET threshold. This is achieved by a
slope control of the rising edge at the driverâs output. The output driver is clamped by an internal 15V Zener diode in
order to protect power MOSFET transistors against undesirable gate over voltage.
(8) Inside power switch MOS transistor
Specific power MOS transistor parameter is as âPOWER MOS TRANSISTOR SECTIONâ in electrical
characteristics table.
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
7 of 9
QW-R119-021.B
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