UC1845 电流模式 PWM 控制器
The UC1842/3/4/5 family of control devices provides the necessary features to implement off-line or dc-to-dc fixed frequency current mode control schemes with a minimal external parts count. Internally implemented circuits include under-voltage lockout featuring start up current less than 1 mA, a precision reference trimmed for accuracy at the error amp input, logic to insure latched operation, a PWM comparator which also provides current limit control, and a totem pole output stage designed to source or sink high peak current. The output stage, suitable for driving N-Channel MOSFETs, is low in the off state.
Differences between members of this family are the under-voltage lockout thresholds and maximum duty cycle ranges
|
UC1845 |
| Topology |
Boost, Flyback, Forward |
| Control Method |
Current |
| Duty Cycle (Max) (%) |
50 |
| Frequency (Max) (kHz) |
450 |
| UVLO Thresholds On/Off (V) |
8.4/7.6 |
| Pin/Package |
14CFP, 20LCCC, 8CDIP |
| Vin (Min) (V) |
7.6 |
| Vin (Max) (V) |
30 |
| Regulated Outputs (#) |
1 |
| Operating Temperature Range (C) |
-55 to 125 |
| Rating |
Military |
UC1845 特性
- Optimized For Off-line and DC-to-DC Converters
- Low Start-Up Current (<1 mA)
- Automatic Feed ForwardCompensation
- Pulse-by-Pulse Current Limiting
- Enhanced Load Response Characteristics
- Under-Voltage Lockout With Hysteresis
- Double Pulse Suppression
- High Current Totem Pole Output
- Internally Trimmed Bandgap Reference
- 500-kHz Operation
- Low RO Error Amp
UC1845 芯片订购指南
| 器件 |
状态 |
温度 (oC) |
价格（美元） |
封装 | 引脚 |
封装数量 | 封装载体 |
丝印标记 |
| 5962-8670404DA |
ACTIVE |
|
14.29 | 100u |
CFP (W) | 14 |
1 | TUBE |
|
| 5962-8670404PA |
ACTIVE |
-55 to 125 |
6.88 | 100u |
CDIP (JG) | 8 |
1 | TUBE |
|
| 5962-8670404XA |
ACTIVE |
-55 to 125 |
14.53 | 100u |
LCCC (FK) | 20 |
1 | TUBE |
|
| UC1845J |
ACTIVE |
-55 to 125 |
4.13 | 100u |
CDIP (JG) | 8 |
1 | TUBE |
|
| UC1845J883B |
ACTIVE |
-55 to 125 |
6.88 | 100u |
CDIP (JG) | 8 |
1 | TUBE |
|
| UC1845L |
ACTIVE |
-55 to 125 |
10.43 | 100u |
LCCC (FK) | 20 |
1 | TUBE |
|
| UC1845L883B |
ACTIVE |
-55 to 125 |
14.53 | 100u |
LCCC (FK) | 20 |
1 | TUBE |
|
| UC1845W |
ACTIVE |
-55 to 125 |
10.43 | 100u |
CFP (W) | 14 |
1 | TUBE |
|
| UC1845W883B |
ACTIVE |
|
14.29 | 100u |
CFP (W) | 14 |
1 | TUBE |
|
UC1845 质量与无铅数据
| 器件 |
环保计划* |
铅/焊球涂层 |
MSL 等级/回流焊峰 |
环保信息与无铅 (Pb-free) |
DPPM / MTBF / FIT 率 |
| 5962-8670404DA |
TBD |
Call TI |
Call TI |
5962-8670404DA |
5962-8670404DA |
| 5962-8670404PA |
TBD |
Call TI |
Call TI |
5962-8670404PA |
5962-8670404PA |
| 5962-8670404XA |
TBD |
Call TI |
Call TI |
5962-8670404XA |
5962-8670404XA |
| UC1845J |
TBD |
A42 |
N/A for Pkg Type |
UC1845J |
UC1845J |
| UC1845J883B |
TBD |
A42 |
N/A for Pkg Type |
UC1845J883B |
UC1845J883B |
| UC1845L |
TBD |
POST-PLATE |
N/A for Pkg Type |
UC1845L |
UC1845L |
| UC1845L883B |
TBD |
POST-PLATE |
N/A for Pkg Type |
UC1845L883B |
UC1845L883B |
| UC1845W |
TBD |
A42 |
N/A for Pkg Type |
UC1845W |
UC1845W |
| UC1845W883B |
TBD |
A42 |
N/A for Pkg Type |
UC1845W883B |
UC1845W883B |
UC1845 工具与软件
UC1845 应用技术支持与电子电路设计开发资源下载
- UC1845数据资料 dataSheet 下载.PDF
- TI 德州仪器电源管理选型与价格参考 . xls
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