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UC3848G-S08-R Datasheet(PDF) 4 Page - Unisonic Technologies

Part No. UC3848G-S08-R
Description  HIGH PERFORMANCE CURRENT MODE CONTROLLERS
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Maker  UTC [Unisonic Technologies]
Homepage  http://www.utc-ic.com
Logo UTC - Unisonic Technologies

UC3848G-S08-R Datasheet(HTML) 4 Page - Unisonic Technologies

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UC3848
LINEAR INTEGRATED CIRCUIT
UNISONICTECHNOLOGIESCO.,LTD
4 of 11
www.unisonic.com.tw
QW-R103-033.F
ABSOLUTE MAXIMUM RATINGS (Ta=25°C, VCC=15V, unless otherwise specified)
PARAMETER
SYMBOL
RATINGS
UNIT
Supply Voltage
VCC
30
V
Input Voltage to VIN Pin
VIN
30
V
Input Voltage to FB Pin
VFB
-0.3 ~ 6.2
V
Input Voltage to CS Pin
VCS
-0.3 ~ 2.8
V
Junction Temperature
TJ
+150
°C
Operating Temperature
TOPR
-40 ~ +125
°C
Storage Temperature
TSTG
-50 ~ +150
°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.
RECOMMENDED OPERATING CONDITIONS
PARAMETER
SYMBOL
RATINGS
UNIT
Supply Voltage
VCC
8.2 ~ 22
V
ELECTRICAL CHARACTERISTICS (Ta=25°C, VCC=15V, unless otherwise specified)
PARAMETER
SYMBOL
TEST CONDITIONS
MIN
TYP
MAX
UNIT
SUPPLY SECTION
Start Up Current
ISTR
VCC=VTHD(ON)-0.1V
22
45
μA
OFF
IOFF
VSS = 0, IFB = 0
7
9
mA
Supply Current with switch
ON
ION
VSS = 5V, IFB = 0
7
9
mA
UNDER-VOLTAGE LOCKOUT SECTION
Start Threshold Voltage
VTHD(ON)
13.5
14.2
15
V
Min. Operating Voltage
VCC(MIN)
7.5
8.2
9
V
Hysteresis
VCC(HY)
6
V
INTERNAL VOLTAGE REFERENCE
Reference Voltage
VREF
Measured at pin VREF
6.3
6.5
6.7
V
CONTROL SECTION
VMIN
0.5
V
VFB Operating Level
VMAX
4.4
V
Burst-Mode Enter FB Voltage
VFB-IN
VCS=0
1.5
V
Reduce-Frequency end FB Voltage
VFB-END VCS=0
1.6
V
Burst-Mode Out FB Voltage
VFB-out VCS=0
1.7
V
Normal
VFB = 4V
61
68
75
kHz
Switch Frequency
Power-Saving
F(SW)
Before enter burst mode
20
40
kHz
DMAX
VFB=4.4V,VCS=0
68
74
80
%
Duty Cycle
DMIN
VFB < 0.5V
0
%
Feedback Resistor
RFB
VFB =0V
16
21
26
k
Ω
Soft-Start Time
TSS
CSS=0.47uF
9.9
11.2
12.6
ms
PROTECTION SECTION
VOVP1
VSS < 3.5V, VFB > 5V
19
V
OVP threshold
VOVP1
VSS=4.8V,VFB=3V
28
OLP threshold
VFB(OLP) VCS > 0V, SS Open
4.7
4.9
5.1
V
Delay Time Of OLP
TD-OLP CSS=0.47uF
55
62
70
mS
OTP threshold
T(THR)
120
135
150
°C
OVP Disable threshold
VSS(DEACT) VFB > 5V, VCC=22V
3.9
4.1
4.3
V
OLP Enable threshold
VSS(ACT) VFB > 5V
5.1
5.4
5.7
V
CURRENT LIMITING SECTION
LEB
tLEB
220
ns
Peak Current Limitation
VCS
VFB=4.4V
0.86
1
V
Threshold Voltage For IVIN=60uA
VSENSE-L IVIN=60uA
0.77
V
DRIVER OUTPUT SECTION
Output Voltage Low State
VOL
ISOURCE = 200 mA
2.5
V
Output Voltage High State
VOH
ISINK = 200 mA
12.2
V
Output Voltage Rise Time
tR
CL = 1.0 nF
200
300
ns
Output Voltage Fall Time
tF
CL = 1.0 nF
50
90
ns


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