Datasheet 搜索 > 稳压芯片 > TI（德州仪器） > UC3825ADW 数据手册 > UC3825ADW 数据手册 1/19 页
器件3D模型￥ 44.201
UC3825ADW 数据手册 - TI（德州仪器）
制造商:
TI（德州仪器）
分类:
稳压芯片
封装:
SOIC-16
描述:
TEXAS INSTRUMENTS UC3825ADW.. 芯片, 快速PWM控制器, SOIC16
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引脚图在P2Hot
原理图在P1P11
封装尺寸在P12P13P14P17P18
型号编码规则在P2
标记信息在P12P13P14P15
封装信息在P12P13P14P15P16P17P18
技术参数、封装参数在P3
应用领域在P16
电气规格在P4P5
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UC3825ADW数据手册
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若手册格式错乱，请下载阅览PDF原文件
UC1823A, UC2823A, UC2823B,
UC3823A, UC3823B, UC1825A,
UC2825A, UC2825B, UC3825A, UC3825B
SLUS334E − AUGUST 1995 − REVISED SEPTEMBER 2010
HIGH-SPEED PWM CONTROLLER
FEATURES
D Improved Versions of the UC3823/UC3825
PWMs
D Compatible with Voltage-Mode or
Current-Mode Control Methods
D Practical Operation at Switching Frequencies
to 1 MHz
D 50-ns Propagation Delay to Output
D High-Current Dual Totem Pole Outputs
(2-A Peak)
D Trimmed Oscillator Discharge Current
D Low 100-μA Startup Current
D Pulse-by-Pulse Current Limiting Comparator
D Latched Overcurrent Comparator With Full
Cycle Restart
DESCRIPTION
The UC3823A and UC3823B and the UC3825A and
UC3825B family of PWM controllers are improved
versions of the standard UC3823 and UC3825 family.
Performance enhancements have been made to several
of the circuit blocks. Error amplifier gain bandwidth product
is 12 MHz, while input offset voltage is 2 mV. Current limit
threshold is assured to a tolerance of 5%. Oscillator
discharge current is specified at 10 mA for accurate dead
time control. Frequency accuracy is improved to 6%.
Startup supply current, typically 100 μA, is ideal for off-line
applications. The output drivers are redesigned to actively
sink current during UVLO at no expense to the startup
current specification. In addition each output is capable of
2-A peak currents during transitions.
BLOCK DIAGRAM
4
5
6
7
3
2
1
OSC
CLK/LEB
RT
CT
RAMP
EAOUT
NI
INV
8
9
15
SS
ILIM
VCC
1.25 V
10GND
(60%)
1.0 V
E/A
1.2 V
0.2 V
OVER CURRENT
CURRENT
LIMIT
R
S
D
5 V
SOFT−START COMPLETE
R
S
D
FAULT LATCH
RESTART
DELAY
T
13
11
14
VC
12
PWM
LATCH
9 mA
250mA
R
S
*
RESTART
DELAY
LATCH
VREF
5.1 V
ON/OFF
UVLO
4 V
INTERNAL
BIAS
16
OUTA
OUTB
PGND
5.1 VREF
”B” 16V/10V
”A” 9.2V/8.4V
PWM COMPARATOR
UDG−02091
V
REF
GOOD
* On the UC1823A version, toggles Q and Q are always low.
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments
semiconductor products and disclaimers thereto appears at the end of this data sheet.
www.ti.com
Copyright © 2004 −2008, Texas Instruments Incorporated
PRODUCTION DATA information is current 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.
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