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| 型號： | UC3825AD |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | High Speed PWM Controller |
| 中文描述： | 高速PWM控制器 |
| 文件頁數(shù)： | 1/15頁 |
| 文件大?。?/td> | 303K |
| 代理商： | UC3825AD |
SLUS334C AUGUST 1995 REVISED AUGUST 2004
FEATURES
Improved Versions of the UC3823/UC3825
PWMs
Compatible with Voltage-Mode or
Current-Mode Control Methods
Practical Operation at Switching Frequencies
to 1 MHz
50-ns Propagation Delay to Output
High-Current Dual Totem Pole Outputs
(2-A Peak)
Trimmed Oscillator Discharge Current
Low 100-
μ
A Startup Current
Pulse-by-Pulse Current Limiting Comparator
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
μ
A, 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
10
GND
(60%)
1.0 V
E/A
1.2 V
0.2 V
OVER CURRENT
CURRENT
LIMIT
R
SD
PWM
LATCH
5 V
SOFTSTART COMPLETE
R
SD
FAULT LATCH
UVLO
RESTART
DELAY
T
13
11
14
VC
12
9 A
250 A
R
S
*
RESTART
DELAY
LATCH
VREF
5.1 V
ON/OFF
4 V
INTERNAL
BIAS
16
OUTA
OUTB
PGND
5.1 VREF
”B” 16V/10V
”A” 9.2V/8.4V
PWM COMPARATOR
UDG02091
VREF 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, Texas Instruments Incorporated
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| UC3825ADTR | High Speed PWM Controller |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| UC3825ADTR | 制造商:TI 制造商全稱:Texas Instruments 功能描述:High Speed PWM Controller |
| UC3825ADW | 功能描述:電流型 PWM 控制器 High Speed PWM Controller RoHS:否 制造商:Texas Instruments 開關(guān)頻率:27 KHz 上升時間: 下降時間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數(shù)量:1 最大工作溫度:+ 105 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TSSOP-14 |
| UC3825ADW | 制造商:Texas Instruments 功能描述:IC's |
| UC3825ADW | 制造商:Texas Instruments 功能描述:FAST PWM CONTROLLER SOIC16 3825 |
| UC3825ADWG4 | 功能描述:電流型 PWM 控制器 High Speed PWM Controller RoHS:否 制造商:Texas Instruments 開關(guān)頻率:27 KHz 上升時間: 下降時間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數(shù)量:1 最大工作溫度:+ 105 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TSSOP-14 |
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