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US3706 Datasheet(PDF) 3 Page - Unisonic Technologies

Part # US3706
Description  CURRENT MODE PWM POWER SWITCH
PDF  8 Pages
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Manufacturer  UTC [Unisonic Technologies]
Direct Link  http://www.utc-ic.com
Logo UTC - Unisonic Technologies

US3706 Datasheet(HTML) 3 Page - Unisonic Technologies

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US3706
Preliminary
CMOS IC
UNISONICTECHNOLOGIESCO.,LTD
3 of 8
www.unisonic.com.tw
QW-R129-001.b
ABSOLUTE MAXIMUM RATING
PARAMETER
SYMBOL
RATINGS
UNIT
VDD Voltage
-0.3~30
V
FB Input Voltage
-0.3~7
V
Source Input Voltage
-0.3~7
V
Operating Junction Temperature
TJ
150
°C
Storage Temperature
TSTG
-55~150
°C
Lead Temperature (Soldering, 10secs)
TL
260
°C
Note: Absolute maximum ratings are those values beyond which the device could be permanently damaged.
Absolute maximum ratings are stress ratings only and functional device operation is not implied.
ELECTRICAL CHARACTERISTICS (TA=25°C , VDD=16V, RT=100KΩ, unless otherwise noted)
PARAMETER
SYMBOL
TEST CONDITIONS
MIN
TYP
MAX
UNIT
SUPPLY SECTION
Start Up Current
ISTR
VDD = VDD(ON)-0.1V
2.5
20
μA
IC Operating current
IOP
VFB=3.5V
2.4
3.0
mA
VDD Zener Clamp current
vCLAMP
IVDD=10mA
26
27.5
29
V
UNDER-VOLTAGE LOCKOUT SECTION
Start Threshold Voltage
VDD(ON)
12
13.5
15
V
Min. Operating Voltage
VDD(MIN)
7
8
9
V
CONTROL SECTION
VFB Open Loop Voltage Level
VFB-OPEN
4.9
5.1
5.3
V
Burst-Mode Out FB Voltage
VFB(OUT)
VSENSE =0
1.6
V
Reduce-Frequency end FB Voltage
VFB(END)
VSENSE =0
2.2
V
Burst-Mode Enter FB Voltage
VFB(IN)
VSENSE =0
1.5
V
Switch Frequency
Normal
FSW
VFB=3.5V
55
60
65
KHz
Power-Saving
Before enter burst mode
17
22
27
KHz
Duty Cycle
DMAX
VFB=3.5V, VSENSE=0
70
77
85
%
Frequency Hopping
FJ(SW)
-4
+4
%
Frequency VDD Stability
FDV
VDD=12V~20V
5
%
Frequency Temperature Stability
FDT
T=-20~100°C
10
%
Feedback Resistor
RFB
17
20
23
KΩ
PROTECTION SECTION
VCC Over Voltage Protection Threshold
VOVP
VFB=3.5V
22.5
23
24.5
V
FB PIN Over Load Protection Threshold
VOLP
4.6
4.8
5.0
V
Power Limiting Debounce Time
TD_PL
100
125
150
mS
Soft start time
TSS
1
2
3
mS
CURRENT LIMITING SECTION
Peak Current Flat Threshold Voltage
VCS-F
VFB=4.2V, Duty≥60%
0.8
V
Peak Current Valley Threshold Voltage
VCS-V
VFB=4.2V, Duty=0%
0.7
V
Lead Edge Blanking Time
TLEB
350
ns
RT SECTION
Output current of RT pin
IRT
90
100
110
uA
Threshold voltage for OTP
VTH_OTP
0.9
1
1.1
V
Mosfet Section
MOSFET Drain-Source Breakdown
Voltage
BVdss
600
V
Static Drain to Source On Resistance
Rdson
1.5
Ω



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