UC3846
LINEAR INTEGRATED CIRCUIT
ABSOLUTE MAXIMUM RATINGS (Ta＝25°C, VDD=15V, unless otherwise specified)
PARAMETER
SYMBOL
RATINGS
UNIT
V
Supply Voltage
Zener Clamp
Zener Current
25
VDD
28
V
10
mA
V
Input Voltage to FB Pin
Input Voltage to CS Pin
Junction Temperature
Operating Temperature
Storage Temperature
VFB
VSENSE
TJ
7
7
V
+150
°C
°C
°C
TOPR
TSTG
-40 ~ +125
-50 ~ +150
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.
OPERATING RANGE
PARAMETER
SYMBOL
VDD
RATINGS
8.2 ~ 21
UNIT
V
Supply Voltage
ELECTRICAL CHARACTERISTICS (Ta＝25°C, VDD=15V, RI=100kΩ ,unless otherwise specified)
PARAMETER
SYMBOL
TEST CONDITIONS
MIN TYP MAX UNIT
SUPPLY SECTION
Start Up Current
ISTR
IOP
VDD = VDD(ON)-0.1V
FB PIN OPEN
22
7
45
9
μA
IC Operating current
mA
UNDER-VOLTAGE LOCKOUT SECTION
Start Threshold Voltage
Min. Operating Voltage
Hysteresis
VTHD(ON)
VDD(MIN)
VDD(HY)
13.5 14.2
15
9
V
V
V
7.5
8.2
6
INTERNAL VOLTAGE REFERENCE
Reference Voltage
VREF
measured at pin VFB
6.3
0.5
6.5
6.7
4.4
V
CONTROL SECTION
VMIN
V
V
VFB Operating Level
VMAX
Burst-Mode Out FB Voltage
VFB(OUT) VSENSE =0
VFB(END) VSENSE =0
1.7
1.6
1.5
68
V
Reduce-Frequency end FB Voltage
Burst-Mode Enter FB Voltage
V
VFB(IN)
VSENSE =0
V
Normal
Switch Frequency
FB PIN OPEN
61
24
75
31
80
kHz
kHz
%
F(SW)
Power-Saving
Before enter burst mode
FB PIN OPEN, VSENSE =0
VFB<0.5V
DMAX
DMIN
FJ(SW)
FDV
68
74
±3
Duty Cycle
0
%
Frequency Hopping
±1.5
±4.5
5
kHz
%
Frequency Variation VS VDD Deviation
Frequency Variation VS Temperature Deviation
Feedback Resistor
VDD=10 to 20V
T=-40 to 105°C
VFB=0V
FDT
5
%
RFB
16
21
26
kΩ
PROTECTION SECTION
OVP threshold
VOVP
FB PIN OPEN
FB PIN OPEN
28
V
OTP threshold
T(THR)
120
135
150
1
°C
CURRENT LIMITING SECTION
Peak Current Limitation
VCS
0.85
V
DRIVER OUTPUT SECTION
Output Voltage Low State
Output Voltage High State
Output Voltage Rise Time
Output Voltage Fall Time
VOL
VOH
tR
ISOURCE = 200 mA
ISINK = 200 mA
CL = 1.0 nF
2.5
V
V
12.2
200
50
300
90
ns
ns
tF
CL = 1.0 nF
UNISONIC TECHNOLOGIES CO., LTD
4 of 10
QW-R103-053.B
www.unisonic.com.tw
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