U3848 Ver la hoja de datos (PDF) - Unisonic Technologies
Número de pieza
componentes Descripción
Fabricante
U3848 Datasheet PDF : 13 Pages
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U3848/A/B/C
FUNCTIONAL DESCRIPTION(Cont.)
15V VCC
C4
C13
5.5V
V FB
IC3
C3
1
8
2
7
UTC
U3848 / A/B/ C
3
6
Driver
4
RT
5
4. 6v
VFB
7.2us
LINEAR INTEGRATED CIRCUIT
VCC
C4
C13
VFB 3.5V
R17
IC3
C3
1
8
2
7
UTC
U3848 /A/B/C
3
6
Driver
4
RT
5
16v
VC C
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.
15v VCC
15v VCC
C4
C13
VFB
IC3
C3
1
8
2
7
UTC
U3848 A/ B/C
3
6
4
5
R17
RT
VOH (MIN )
Isink= 200 mA
C4
C13
VFB
IC3
C3
1
8
2
7
UTC
U3848 /A/B/C
3
6
4
5
R17
RT
Isour ce =200 mA
VOL (MIN)
FIG.10 driver test circuit with sink current
FIG.11 driver test circuit with source current
(5) External power switch MOS transistor
Because U3848/A/B/C 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
10 of 13
QW-R103-033,B
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