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