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| U3848 Datasheet, PDF (8/12 Pages) Unisonic Technologies – HIGH PERFORMANCE CURRENT MODE PWM CONTROLLERS | |||
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UC3848
 FUNCTIONAL DESCRIPTION(Cont.)
15V VCC
C4
C13
5.5V
VFB
IC3
C3
1
8
2
7
UTC
UC3848
3
6
Driver
4
5
4.6v
VFB
7.2us
LINEAR INTEGRATED CIRCUIT
VCC
C4
C13
VFB 3.5V
R17
IC3
C3
1
8
2
7
UTC
UC3848
3
6
Driver
4
5
16v
VCC
7.2us
FIG.8 OLP test circuit
FIG.9 OVP test circuit
(4) Driver Output Section
Rise edge time of driver output is about 200ns for avoiding Low EMI. When driver output VOL(MAX) is less than
2.5V with 200mA source current, and VOH(MIN) is more than 12.2V with 200mA sink current.
(5) External power switch MOS transistor
Because UC3848 driver output voltage Low level threshold is about 2.5V, User may apply power MOS
transistors with bigger threshold. 4N60 is recommended normally.
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
8 of 12
QW-R103-033,C
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