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| 型号： | UCC2891DR |
| 厂商： | Texas Instruments |
| 文件页数： | 8/41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
DETAILED PIN DESCRIPTIONS
RDEL (pin 1)
This pin is internally connected to an approximately 2.5-V DC source. A resistor (R DEL ) to GND (pin 6) sets the
turn-on delay for both gate drive signals of the UCC2981 family of controllers. The delay time is identical for both
switching transitions, between OUT (pin 13) is turning off and AUX (pin 14) is turning on as well as when AUX
(pin 14) is turning off and OUT (pin 13) is turning on. The delay time is defined as:
t DEL1 + t DEL2 + 11.1
10 * 12
R DEL ) 15
10 * 9 seconds
(1)
For proper selection of the delay time refer to the various references describing the design of active clamp power
converters.
RTON (pin 2)
This pin is internally connected to an approximately 2.5-V DC source. A resistor (R ON ) to GND (pin 6) sets the
charge current of the internal timing capacitor. The RTON pin, in conjunction with the RTOFF pin (pin 3) are used
to set the operating frequency and maximum operating duty cycle of the UCC2891 family.
RTOFF (pin3)
This pin is internally connected to an approximately 2.5-V DC source. A resistor (R OFF ) to GND (pin 6) sets the
discharge current of the internal timing capacitor. The RTON and RTOFF pins are used to set the switching
period (T SW ) and maximum operating duty cycle (D MAX ) according to the following equations:
t ON + 36.1
10 * 12
R ON * t DEL1 seconds
(2)
t OFF + 15
10 * 12
R OFF ) t DEL1 ) 170
10 * 9 seconds
(3)
T SW + t ON ) t OFF
(4)
D MAX +
t ON
T SW
(5)
VREF (pin 4)
The controller ’s internal, 5-V bias rail is connected to this pin. The internal bias regulator requires a good quality
ceramic bypass capacitor (C VREF ) to GND (pin 6) for noise filtering and to provide compensation to the regulator
circuitry. The recommended C VREF value is 0.22- μ F. The minimum bypass capacitor value is 0.022- μ F limited
by stability considerations of the bias regulator, while the maximum is approximately 22- μ F. Also, capacitor
value on VDD should be minimum 10 times greater than that on VREF.
The VREF pin is internally current limited and can supply approximately 5-mA to external circuits. The 5-V bias
is only available when the undervoltage lock out (UVLO) circuit enables the operation of UCC289x controllers.
For the detailed functional description of the undervoltage lock out (UVLO) circuit refer to the Functional
Description section of this datasheet.
8
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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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