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PDF U3848 Data sheet ( Hoja de datos )
| Número de pieza | U3848 | |
| Descripción | HIGH PERFORMANCE CURRENT MODE PWM CONTROLLERS | |
| Fabricantes | Unisonic Technologies | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de U3848 (archivo pdf) en la parte inferior de esta página. Total 13 Páginas | ||
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UNISONIC TECHNOLOGIES CO., LTD
U3848/A/B/C
LINEAR INTEGRATED CIRCUIT
HIGH PERFORMANCE
CURRENT MODE PWM
CONTROLLERS
DESCRIPTION
The UTC U3848/A/B/C is designed to provide several special
enhancements to satisfy the needs: Power-Saving mode for low
standby power, Over Current Protection (OCP), Over Voltage
Protection (OVP), Over Load Protection (OLP), Over Temperature
Protection (OTP) etc protection features. IC will be shutdown when
either protection arise and can auto-restart. Its frequency may be
defined by user through resistor RT to external ground. UVLO
featuring typical start-up current 20µA, and VCC(ON) 12.6V, VCC(OFF)
8.1 . Lower typical operation current Icc 3.7mA at inactive output.
The output stage, suitable for driving N-Channel MOSFETs, can
operate to duty cycles approach 70%. The U3848/A/B/C are fully
pin-to-pin compatible with UC3842. But pin RT only connected a
resistor to ground to decide switch frequency, and pin FB with an
4kΩ pull up resistor to internal reference voltage. The U3848/A/B/C
also have soft-start function avoiding overshoot, and controlled
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driver output rise edge time tR for low EMI.
FEATURES
* Low startup and operation current
* User defined switching frequency(Norm is 70kHz)
* Max duty cycle 70%
* Power-saving mode for low power
* Under voltage lockout with hysteresis
* Over temperature protection
* Overload protection
* Over voltage protection
* Leading edge blanking
* Soft start
ORDERING INFORMATION
Order Number
Normal
Lead Free Plating
U3848-D08-T
U3848L-D08-T
U3848-S08-R
U3848L-S08-R
U3848-S08-T
U3848L-S08-T
U3848A-D08-T
U3848AL-D08-T
U3848A-S08-R
U3848AL-S08-R
U3848A-S08-T
U3848AL-S08-T
U3848B-D08-T
U3848BL-D08-T
U3848B-S08-R
U3848BL-S08-R
U3848B-S08-T
U3848BL-S08-T
U3848C-D08-T
U3848CL-D08-T
U3848C-S08-R
U3848CL-S08-R
U3848C-S08-T
U3848CL-S08-T
Package
DIP-8
SOP-8
SOP-8
DIP-8
SOP-8
SOP-8
DIP-8
SOP-8
SOP-8
DIP-8
SOP-8
SOP-8
www.unisonic.com.tw
Copyright © 2005 Unisonic Technologies Co., Ltd
DIP-8
SOP -8
*Pb-free plating product number:
U3848L/U3848AL/U3848BL/U3848CL
Packing
Tube
Tape Reel
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Tape Reel
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Tape Reel
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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
Input Voltage to CS Pin
VFB -0.3 ~ 6.2
VCS -0.3 ~ 2.8
V
V
Input Voltage to RT Pin
VRT -0.3 ~ 6.2
V
Junction Temperature
Operating Temperature
TJ
TOPR
+150
-40 ~ +125
°C
°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
Supply Current with switch
OFF
ON
ISTR VCC=12.5V
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
VCC(HY)
INTERNAL VOLTAGE REFERENCE
Reference Voltage
VREF measured at pin VREF
CONTROL SECTION
Switch Frequency
Normal
Power-Saving
Duty Cycle
MAX
MIN
VFB Operating Level
MIN
MAX
Feedback Resistor
External Resistor for controlling Current
Source of OSC
F(SW)
DMAX
DMIN
VMIN
VMAX
RFB
RT
VFB = 4V
VFB = 1V
U3848/B(Note1)
U3848A/C(Note2)
VFB < 0.5V
Soft-Start Time
CSS=0.05uF
TSS CSS=0.1uF
CSS=1uF
PROTECTION SECTION
OVP threshold
OLP threshold
OTP threshold
OVP Disable threshold
OLP Enable threshold
Spike Blanking time
V(OVP) VSS < 3.5V, VFB > 5V
VFB(OLP) VSS > 5.4V
T(THR)
VSS(DEACT) VFB > 5V, VCC > 17V
VSS(ACT) VFB > 5V
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
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QW-R103-033,B
5 Page 
U3848/A/B/C
TYPICAL APPLICATION CIRCUIT
LINEAR INTEGRATED CIRCUIT
AC IN
TH1
CX1
F1
BD1
D3 D1 L3 R12
C8 TR1
CD1 RD1
+ C5
+
C9
R7 IC3
45
R6 Q1 D2
C15
3 UTC 6
2
U3848 /
A/B /C
7
18
R
R5
R2
IC1
R11
C14
C3
+ C4
R17
RF
C2
IC2
R4 R3
+
5V 3A
GND
CY1
FIG.12 U3848/A/B/C Typical Application Circuit
Table1 Components Reference description for U3848/A/B/C application circuit
C12 CC
10nF/1000V
D3 Diode
UF1007
R
C14 CC
100nF/50V
IC1 IC
PC817
TH1
C2 CC
33nF/50V
IC2 IC
TL431CLP
BD1
CX1
104/275V
IC3 IC
U3848/A/B/C
RD1
C5 EC
1000uF/15V
L3 L
1.2uH
R12
C4 CC
22uF/50V
Q1 MOS
4N60
TR1
C8
C9
CD1
CY1
EC
EC
CC
CC
68uF/400V
1000uF/16V
1nF/1KV
4.7nF/250V
R7 R
R17 R
R2 R
R3 R
68KΩ
1.2Ω/1W
680Ω
ADJ
1/8W
1/8W
1/8W
1/8W
RF
C15
D1 Diode
C63-004
R4 R
5.6KΩ
1/8W
D2 Diode
1N4148
R5 R
5.6KΩ
1/8W
Note: C5 and C9 are lower ESR capacitors.
R
R
R
R
R
CC
470KΩ
SCK-103
KBP-208
10Ω
3.3kΩ
optional
4.7kΩ
0.1µF/50V
1/8W
1/8W
1/8W
1/8W
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
11 of 13
QW-R103-033,B
11 Page | ||
| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet U3848.PDF ] | |
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| U3848B | HIGH PERFORMANCE CURRENT MODE PWM CONTROLLERS | Unisonic Technologies |
| U3848C | HIGH PERFORMANCE CURRENT MODE PWM CONTROLLERS | Unisonic Technologies |
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