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UC3856 Datasheet(PDF) 4 Page - E-Tech Electronics LTD

Part # UC3856
Description  LOW COST POWER-SAVING MODE PWM CONTROLLER FOR FLYBACK CONVERTERS
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Manufacturer  ETL [E-Tech Electronics LTD]
Direct Link  http://e-tech.com.hk
Logo ETL - E-Tech Electronics LTD

UC3856 Datasheet(HTML) 4 Page - E-Tech Electronics LTD

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UC3856
Preliminary
LINEAR INTEGRATED CIRCUIT
UNISONICTECHNOLOGIESCO.,LTD
4 of 9
www.unisonic.com.tw
QW-R103-077.a
ABSOLUTE MAXIMUM RATINGS (TA=25°C, VDD =15V, unless otherwise specified)
PARAMETER
SYMBOL
RATINGS
UNIT
Supply Voltage
VDD
30
V
Input Voltage to FB Pin
VFB
-0.3~7
V
Input Voltage to CS Pin
VSENSE
-0.3~7
V
Junction Temperature
TJ
+150
C
Operating Temperature
TOPR
-40~+125
°C
Storage Temperature
TSTG
-50~+150
C
Notes: 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.
OPERATING RANGE
PARAMETER
SYMBOL
RATINGS
UNIT
Supply Voltage
VDD
10~26
V
ELECTRICAL CHARACTERISTICS (TA=25°C, VDD=15V, RI =100KΩ,unless otherwise specified)
PARAMETER
SYMBOL
TEST CONDITIONS
MIN
TYP
MAX
UNIT
HV START
Supply Current from ST Pin
IST
2
2.8
5
mA
Start Pin Leakage Current After Startup
IEAKAGE
10
μA
SUPPLY SECTION
Start Up Current
ISTR
VDD=VDD(ON)-0.1V
5
20
μA
IC Operating current
IOP
VFB=3.5V
1.5
5
mA
VDD Over Voltage Protection (Latchoff)
VDD_CLAMP
I_CLAMP=20mA
26.5
2.80
29.5
mA
UNDER-VOLTAGE LOCKOUT SECTION
Start Threshold Voltage
VTHD(ON)
12
13
14
V
Min. Operating Voltage
VDD(MIN)
5.5
6.5
7.5
V
CONTROL SECTION
VFB Open Loop Voltage Level
VFB-OPEN
5.15
5.45
5.75
V
PWM Input Gain
AVCS
∆VFB/∆VCS
3
V/V
Burst-Mode Out FB Voltage
VFB(OUT)
VSENSE =0
1.87
V
Reduce-Frequency end FB Voltage
VFB(END)
VSENSE =0
2.5
V
Burst-Mode Enter FB Voltage
VFB(IN)
VSENSE =0
1.56
V
Switch Frequency
Normal
FSW
VFB=3.5V, RI=100KΩ
55
62
67
KHz
Power-Saving
Before enter burst mode
22
KHz
Duty Cycle
DMAX
VFB=3.5V, VSENSE=0
75
%
Frequency Hopping
FJ(SW)
-4
+4
%
Frequency VDD Stability
FDV
VDD=12V~20V
5
%
Frequency Temperature Stability
FDT
T=-20~100°C
1.5
5
%
Feedback Resistor
RFB
11
KΩ
PROTECTION SECTION
VCC Over Voltage Protection Threshold
VOVP
27.2
V
FB PIN Over Load Protection Threshold
VOLP
4.0
4.5
5.5
V
Over Load Protection Delay-Time
TDelay
VFB=3~5V (OLP)
98
mS
OTP threshold
T(THR)
VFB=4.2V
145
°C
CURRENT LIMITING SECTION
Over Current Flat Threshold Voltage
VCS
VFB=4.2V
0.65
0.75
0.85
V
Lead Edge Blanking Time
TLEB
400
ns
DRIVER OUTPUT SECTION
Output Voltage Low State
VOL
VDD=16,IO=-20mA
0.8
V
Output Voltage High State
VOH
VDD=16,IO=20mA
10
V
Output Voltage Rise Time
tR
CL=1.0nF
110
ns
Output Voltage Fall Time
tF
CL=1.0nF
70
ns


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