Datasheet 搜索 > TI（德州仪器） > UCC28083 数据手册 > UCC28083 用户编程技术手册 1/28 页
￥ 0
UCC28083 用户编程技术手册 - TI（德州仪器）
制造商:
TI（德州仪器）
描述:
具有可编程斜率补偿的电流模式推挽 PWM
Pictures:
3D模型
符号图
焊盘图
引脚图
产品图
页面导航:
导航目录
UCC28083数据手册
Page:
of 28 Go
若手册格式错乱，请下载阅览PDF原文件
UCC28083, UCC28084, UCC28085, UCC28086
UCC38083, UCC38084, UCC38085, UCC38086
SLUS488D -- SEPTEMBER 2002 -- REVISED AUGUST 2006
8-PIN CURRENT MODE PUSH-PULL PWM CONTROLLERS
WITH PROGRAMMABLE SLOPE COMPENSATION
1
www.ti.com
FEATURES
D Programmable Slope Compensation
D Internal Soft-Start on the UCC38083/4
D Cycle-by-Cycle Current Limiting
D Low Start-Up Current of 120 μAand1.5mA
Typical Run Current
D Single External Component Oscillator
Programmablefrom50kHzto1MHz
D High-Current Totem-Pole Dual Output Stage
Drives Push-Pull Configuration with 1-A Sink
and 0.5-A Source Capability
D Current Sense Discharge Transistor to
Improve Dynamic Response
D Internally Trimmed Bandgap Reference
D Undervoltage Lockout with Hysteresis
APPLICATIONS
D High-Efficiency Switch-Mode Power Supplies
D Telecom dc-to-dc Converters
D Point-of -Load or Point-of-Use Power Modules
D Low-Cost Push-Pull and Half-Bridge
Applications
DESCRIPTION
The UCC38083/4/5/6 is a family of BiCMOS pulse width
modulation (PWM) controllers for dc-to-dc or off-line
fixed-frequency current-mode switching power
supplies. The dual output stages are configured for the
push-pull topology. Both outputs switch at half the
oscillator frequency using a toggle flip-flop. The dead
time between the two outputs is typically 110 ns, limiting
each output’s duty cycle to less than 50%.
The new UCC3808x family is based on the UCC3808A
architecture. The major differences include the addition
of a programmable s lope compensation ramp to the CS
signal and the removal of the error amplifier. The current
flowing out of the ISET pin through an external resistor
is monitored internally to set the magnitude of the slope
compensation function. This device also includes an
internal discharge transistor from the CS pin to ground,
which is activated at each clock cycle after the pulse is
terminated. This discharges any filter capacitance on
the CS pin during each cycle and helps minimize filter
capacitor values and current sense delay.
The UCC38083 and the UCC38084 devices have a
typical soft-start interval time of 3.5 ms while the
UCC38085 and the UCC38086 has less than 100 μsfor
applications where internal soft-start is not desired.
The UCC38083 and the UCC38085 devices have the
turn-on/off thresholds of 12.5 V / 8.3 V, while the
UCC38084 and the UCC38086 has the turn-on/off
thresholds of 4.3 V / 4.1 V. Each device is offered in 8-pin
TSSOP (PW), 8-pin SOIC (D) and 8-pin PDIP (P)
packages.
PRODUCTION DATA information is c urrent as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
Copyright © 2002--2006, Texas Instruments Incorporated
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications o
f
Te
x
as Instruments
semiconductor products and disclaimers thereto appears at the end of this data sheet.
UDG--01080
BASIC APPLICATION
OUTA
OUTB
CS
CTRL
RT
ISET
GND
VDD
R
SET
R
T
POWER
TRANSFORMER
C
F
R
F
R
S
V
IN
UCC3808x
FEEDBACK
V
OUT
器件 Datasheet 文档搜索
AiEMA 数据库涵盖高达 72,405,303 个元件的数据手册，每天更新 5,000 多个 PDF 文件
