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| 型号： | UC2845D |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | 1 A SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDSO14 |
| 封装： | GREEN, PLASTIC, MS-012AB, SOIC-14 |
| 文件页数： | 1/25页 |
| 文件大小： | 745K |
| 代理商： | UC2845D |
www.ti.com
FEATURES
DESCRIPTION
BLOCK DIAGRAM
11
A/B
Vcc
7 12
5
9
GROUND
4
7
RT/CT
2
3
VFB
1
COMP
3
5
CURRENT
SENSE
34 V
2.50 V
OSC
UVLO
S/R
5 V
REF
VREF
Good
Logic
Internal
BIAS
Error
Amp
2R
R
1 V
CURRENT
SENSE
COMPARATOR
PWM
LATCH
S
R
T
8 14
VREF
5 V
50 mA
7
VC
10
6
OUTPUT
8
5
POWER
GROUND
Note 1:
Note 2:
A = DIL8 Pin Number. B = SO14 and CFP14 Pin Number.
Toggle flip flop used only in 1844 and 1845.
SLUS223C – APRIL 1997 – REVISED JUNE 2007
CURRENT MODE PWM CONTROLLER
Optimized For Off-line and DC-to-DC
The UC1842/3/4/5 family of control devices provides
Converters
the necessary features to implement off-line or
dc-to-dc
fixed
frequency
current
mode
control
Low Start-Up Current (<1 mA)
schemes with a minimal external parts count.
Automatic Feed Forward Compensation
Internally implemented circuits include under-voltage
Pulse-by-Pulse Current Limiting
lockout featuring start up current less than 1 mA, a
precision reference trimmed for accuracy at the error
Enhanced Load Response Characteristics
amp input, logic to insure latched operation, a PWM
Under-Voltage Lockout With Hysteresis
comparator which also provides current limit control,
Double Pulse Suppression
and a totem pole output stage designed to source or
sink high peak current. The output stage, suitable for
High Current Totem Pole Output
driving N-Channel MOSFETs, is low in the off state.
Internally Trimmed Bandgap Reference
Differences between members of this family are the
500-kHz Operation
under-voltage lockout thresholds and maximum duty
Low R
O Error Amp
cycle ranges. The UC1842 and UC1844 have UVLO
thresholds of 16 VON and 10 VOFF, ideally suited to
off-line applications. The corresponding thresholds
for the UC1843 and UC1845 are 8.4 V and 7.6 V.
The UC1842 and UC1843 can operate to duty cycles
approaching 100%. A range of zero to 50% is
obtained by the UC1844 and UC1845 by the addition
of an internal toggle flip flop which blanks the output
off every other clock cycle.
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.
PRODUCTION DATA information is current as of publication date.
Copyright 1997–2007, Texas Instruments Incorporated
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| UC2845D8 | 功能描述:电流型 PWM 控制器 Current Mode PWM RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
| UC2845D8G4 | 功能描述:电流型 PWM 控制器 Current-Mode PWM Controller RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
| UC2845D8TR | 功能描述:电流型 PWM 控制器 Current-Mode PWM Controller RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
| UC2845D8TRG4 | 功能描述:电流型 PWM 控制器 Current-Mode PWM Controller RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
| UC2845DG | 功能描述:电流型 PWM 控制器 52kHz 1A Current PWM w/48% Duty Cycle Max RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
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