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| 型号： | UCC2891DR |
| 厂商： | Texas Instruments |
| 文件页数： | 19/41页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR FLYBK ISO CM 16SOIC |
| 标准包装： | 2,500 |
| PWM 型： | 电流模式 |
| 输出数： | 1 |
| 频率 - 最大： | 1MHz |
| 占空比： | 74% |
| 电源电压： | 8.5 V ~ 16 V |
| 降压： | 无 |
| 升压： | 无 |
| 回扫： | 是 |
| 反相： | 无 |
| 倍增器： | 无 |
| 除法器： | 无 |
| Cuk： | 无 |
| 隔离： | 是 |
| 工作温度： | -40°C ~ 125°C |
| 封装/外壳： | 16-SOIC（0.154"，3.90mm 宽） |
| 包装： | 带卷 (TR) |
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UCC2891, UCC2892
UCC2893, UCC2894
SLUS542F ? OCTOBER 2003 ? REVISED JULY 2009
APPLICATION INFORMATION: SETUP GUIDE
The UCC2891 family offers a highly integrated feature set and excellent accuracy to control an active clamp
forward or active clamp flyback power converter. In order to take advantage of all the benefits integrated in these
controllers, the following procedure can simplify the setup and avoid unnecessary iterations in the design
procedure. Refer to Figure 7 setup diagrams for component names.
Before the controller design begins, the power stage design must be completed. From the power stage design
the following operating parameters are needed to complete the setup procedure of the controller:
D
D
D
D
D
D
D
D
D
D
D
Switching frequency (f SW )
Maximum operating duty cycle (D MAX )
Soft start duration (t SS )
Gate drive power requirements of the external power MOSFETs (Q G(main) , Q G(aux) )
Bias method and voltage for steady state operation (bootstrap or bias supply)
Gate drive turn-on delay (t DEL )
Turn?on input voltage threshold (V ON )
Minimum operating input voltage (V OFF ) where V IN (off) < V IN(on)
Maximum operating input voltage (V OVP )
overvoltage protection hysteresis (V OVH )
The down slope of the output inductor current waveform reflected across the primary side current sense
resistor dV L dt
Step 1. Oscillator
The two timing elements of the oscillator can be calculated from f SW and D MAX by the following two equations:
R ON +
37.33
t ON
10 * 12
s
W +
f SW
D MAX
37.33
10 * 12
W
s
(9)
R OFF +
16
t OFF
10 * 12
s
W +
f SW
1 * D MAX
16 10 * 12
W
s
(10)
where D MAX is a dimensionless number between 0 and 1.
Step 2. Soft Start
Once R ON is defined, the charge current of the soft-start capacitor can be calculated as:
I SS + 0.43
V REF
2
1
R ON
(11)
During soft start, C SS is being charged from 0 V to 5 V by the calculated I SS current. The actual control range
of the soft-start capacitor voltage is between 1.25 V and 4.5 V. Therefore, the soft-start capacitor value must
be based on this narrower control range and the required start up time (t SS ) according to:
C SS +
I SS t SS
4.5 V * 1.25 V
www.ti.com
(12)
19
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相关代理商/技术参数 |
参数描述 |
|---|---|
| UCC2891DRG4 | 功能描述:电流型 PWM 控制器 Current Mode Active Clamp 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 |
| UCC2891EVM | 功能描述:电源管理IC开发工具 UCC2891 Eval Mod RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V |
| UCC2891EVM-520 | 功能描述:电源管理IC开发工具 Eval Mod for UCC289 RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V |
| UCC2891PW | 功能描述:电流型 PWM 控制器 Current Mode Active Clamp 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 |
| UCC2891PWG4 | 功能描述:电流型 PWM 控制器 Current Mode Active Clamp 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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