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U3848B Schematic ( PDF Datasheet ) - Unisonic Technologies

Teilenummer U3848B
Beschreibung HIGH PERFORMANCE CURRENT MODE PWM CONTROLLERS
Hersteller Unisonic Technologies
Logo Unisonic Technologies Logo 




Gesamt 13 Seiten
U3848B Datasheet, Funktion
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
4kpull up resistor to internal reference voltage. The U3848/A/B/C
also have soft-start function avoiding overshoot, and controlled
www.DataSheet4U.com
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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U3848B Datasheet, Funktion
U3848/A/B/C
LINEAR INTEGRATED CIRCUIT
ELECTRICAL CHARACTERISTICS(Cont.)
PARAMETER
SYMBOL TEST CONDITIONS
DRIVER OUTPUT SECTION
Output Voltage Low State
VOL ISOURCE = 200 mA
Output Voltage High State
VOH ISINK = 200 mA
U3848B
CL = 1.0 nF
Output Voltage Rise Time
U3848C
tR CL = 1.0 nF
U3848/A
CL = 1.0 nF
Output Voltage Fall Time
tF CL = 1.0 nF
Note: 1. RT=65kshould be connected for U3848/ U3848B.
2. U3848A/C denote U3848A and U3848C.
MIN TYP MAX UNIT
2.5
12.2
70 150
200 300
300 400
50 90
V
V
ns
ns
ns
ns
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
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U3848B pdf, datenblatt
U3848/A/B/C
TYPICAL CHARACTERISTICS(Cont.)
LINEAR INTEGRATED CIRCUIT
Feedback Voltage During Loadjump From10%
Up To 100% Load (VDCIN=120V)
120mV
3.86V
1.64kHz
850 Hz
Ch1 max
6.00V
Ch1 min
460 mV
Ch1 frequency
785 .5 Hz
Feedback Voltage During Loadjump From10%
Up To 100% Load (VDCIN=350V)
60.0 mV
3.30 V
3.29kHz
1.70kHz
Ch1 max
5.90V
Ch1 min
40.0mV
Ch1 frequency
1.906kHz
Ch1 1.00V
M 400 s A Ch1
3.18V
Ch1 1.00 V
M 200 s A Ch1
2.68 V
Startup With Full Load Condition At VDCIN=120V,
Vc4 and Vout
12.3V
12.3V
VC4
VOUT
Ch1 max
5.04V
Ch1 min
1.32V
Ch1 frequency
----- Hz
Startup With Full Load Condition At VDCIN=350V,
Vc4 and Vout
12.3V
12.3V
VC4
VOUT
Ch1 max
5.04V
Ch1 min
-120 mV
Ch1 frequency
----- Hz
Ch1 2.00V Ch2 5.00V M 10.0ms A Ch1
3.16V
Ch1 2.00V Ch2 5.00V M 10.0ms A Ch1
3.16V
Startup Behavior At Nominal Load Condition VDCIN=120 V
VC4
120mV
12.3V
357Hz
21.2Hz
Startup Behavior At Nominal Load Condition VDCIN=350 V
VC4
240 mV
12.0V
1.79kHz
147 Hz
VFB
VSS
VFB
VSS
Ch1 2.00V Ch2 2.00V M 4 .00 ms A Ch3
Ch3 2.00V
4 .96 V
Ch1 2.00 V Ch2 2.00V M 4.00ms A Ch3
Ch3 2.00 V
4.96V
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
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