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U3848BのメーカーはUnisonic Technologiesです、この部品の機能は「HIGH PERFORMANCE CURRENT MODE PWM CONTROLLERS」です。 |
部品番号 | U3848B |
| |
部品説明 | HIGH PERFORMANCE CURRENT MODE PWM CONTROLLERS | ||
メーカ | Unisonic Technologies | ||
ロゴ | |||
このページの下部にプレビューとU3848Bダウンロード(pdfファイル)リンクがあります。 Total 13 pages
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
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
Tube
Tube
Tape Reel
Tube
Tube
Tape Reel
Tube
Tube
Tape Reel
Tube
1 of 13
QW-R103-033.B
1 Page U3848/A/B/C
PIN CONFIGURATION
SS 1
FB 2
CS 3
RT 4
LINEAR INTEGRATED CIRCUIT
8 VREF
7 VCC
6 OUT
5 GND
PIN DESCRIPTION
PIN SYMBOL
1 SS
2 FB
3 CS
4 RT
5 GND
6 OUT
7 VCC
8 VREF
FUNCTION
Soft-start
Feedback
Controller current sense input
The resistor controlling switch frequency
Ground
Output to the gate of external power MOS
Supply voltage
Inter 6.3V reference voltage, connected with the filter capacitor
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
3 of 13
QW-R103-033,B
3Pages 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=65kΩ should 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
6 of 13
QW-R103-033,B
6 Page | |||
ページ | 合計 : 13 ページ | ||
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PDF ダウンロード | [ U3848B データシート.PDF ] |
データシートを活用すると、その部品の主な機能と仕様を詳しく理解できます。 ピン構成、電気的特性、動作パラメータ、性能を確認してください。 |
部品番号 | 部品説明 | メーカ |
U3848 | HIGH PERFORMANCE CURRENT MODE PWM CONTROLLERS | Unisonic Technologies |
U3848A | HIGH PERFORMANCE CURRENT MODE PWM CONTROLLERS | Unisonic Technologies |
U3848B | HIGH PERFORMANCE CURRENT MODE PWM CONTROLLERS | Unisonic Technologies |
U3848C | HIGH PERFORMANCE CURRENT MODE PWM CONTROLLERS | Unisonic Technologies |