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U3848 Datasheet(PDF) 5 Page - Unisonic Technologies

Part No. U3848
Description  HIGH PERFORMANCE CURRENT MODE PWM CONTROLLERS
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Maker  UTC [Unisonic Technologies]
Homepage  http://www.utc-ic.com
Logo UTC - Unisonic Technologies

U3848 Datasheet(HTML) 5 Page - Unisonic Technologies

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U3848/A/B/C
LINEAR INTEGRATED CIRCUIT
UNISONICTECHNOLOGIESCO.,LTD
5 of 13
www.unisonic.com.tw
QW-R103-033,B
ABSOLUTE MAXIMUM RATINGS (Ta=25°C, VCC=15V, RT=75kΩ, unless otherwise specified)
PARAMETER
SYMBOL
RATINGS
UNIT
Supply Voltage
VCC
26
V
Input Voltage to FB Pin
VFB
-0.3 ~ 6.2
V
Input Voltage to CS Pin
VCS
-0.3 ~ 2.8
V
Input Voltage to RT Pin
VRT
-0.3 ~ 6.2
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.
OPERATING RANGE
PARAMETER
SYMBOL
RATINGS
UNIT
Supply Voltage
VCC
8.2 ~ 21
V
ELECTRICAL CHARACTERISTICS (Ta=25°C, VCC=15V, RT=75kΩ, unless otherwise specified)
PARAMETER
SYMBOL
TEST CONDITIONS
MIN
TYP
MAX
UNIT
SUPPLY SECTION
Start Up Current
ISTR
VCC=12.5V
27
45
µA
OFF
IOFF
VSS = 0, IFB = 0
3.7
5.5
mA
Supply Current with switch
ON
ION
VSS = 5V, IFB = 0
4.0
6.0
mA
UNDER-VOLTAGE LOCKOUT SECTION
Start Threshold Voltage
VTHD(ON)
11.8
12.6
13.4
V
Min. Operating Voltage
VCC(MIN)
7.6
8.1
8.6
V
Hysteresis
VCC(HY)
4.5
V
INTERNAL VOLTAGE REFERENCE
Reference Voltage
VREF
measured at pin VREF
6.1
6.3
6.6
V
CONTROL SECTION
U3848/B(Note1)
85
95
105
kHz
Normal
VFB = 4V
U3848A/C(Note2)
61
68
75
kHz
Switch Frequency
Power-Saving
F(SW)
VFB = 1V
17
20
23
kHz
MAX
DMAX
65
70
75
%
Duty Cycle
MIN
DMIN
VFB < 0.5V
0
%
MIN
VMIN
0.5
V
VFB Operating Level
MAX
VMAX
4.4
V
Feedback Resistor
RFB
2.6
3.8
5.0
k
External Resistor for controlling Current
Source of OSC
RT
75
k
CSS=0.05uF
6
ms
CSS=0.1uF
12
ms
Soft-Start Time
TSS
CSS=1uF
120
ms
PROTECTION SECTION
OVP threshold
V(OVP)
VSS < 3.5V, VFB > 5V
15.2
16
16.8
V
OLP threshold
VFB(OLP) VSS > 5.4V
4.4
4.6
4.9
V
OTP threshold
T(THR)
120
135
150
°C
OVP Disable threshold
VSS(DEACT) VFB > 5V, VCC > 17V
3.7
3.9
4.2
V
OLP Enable threshold
VSS(ACT) VFB > 5V
4.9
5.1
5.4
V
Spike Blanking time
TSB
7.2
µs
CURRENT LIMITING SECTION
LEB
tLEB
220
ns


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