参数资料
| 型号： | UCC28250PW |
| 厂商： | Texas Instruments |
| 文件页数： | 19/53页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR PWM CM/VM 20-TSSOP |
| 标准包装： | 70 |
| PWM 型： | 电流/电压模式 |
| 输出数： | 1 |
| 频率 - 最大： | 1MHz |
| 占空比： | 100% |
| 电源电压： | 4.7 V ~ 17 V |
| 降压： | 无 |
| 升压： | 无 |
| 回扫： | 无 |
| 反相： | 无 |
| 倍增器： | 无 |
| 除法器： | 无 |
| Cuk： | 无 |
| 隔离： | 无 |
| 工作温度： | -40°C ~ 125°C |
| 封装/外壳： | 20-TSSOP（0.173"，4.40mm 宽） |
| 包装： | 管件 |
| 其它名称： | 296-27776-5 UCC28250PW-ND |
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SLUSA29C – APRIL 2010 – REVISED JULY 2011
FB/EA- (2/9)
FB/EA- is the inverting input of the UCC28250 ’ s internal error amplifier.
When the UCC28250 is configured for secondary-side control, connect the output voltage sensing divider to this
pin. The voltage divider can be selected according to the voltage on REF/EA+ pin. Referring to Figure 13 , pick
the lower resistor R O1 value arbitrarily, and choose the upper resistor R O2 value as:
R O2 = ? - 1 ÷ ′ R O1
? V O ?
è V REF / EA + ?
(8)
Because the control loop gain is affected by voltage divider resistor values, choose an appropriate R O1 value so
that the voltage loop DC gain is larger than 40 dB to prevent interference between the primary-side control loop
and the SR control loop during start up.
When the UCC28250 is sitting on the primary side, the error amplifier is connected as a voltage follower.
Connect FB/EA- directly with COMP pin.
The maximum voltage allowed on FB/EA- pin is 3.7 V.
COMP (3/10)
The COMP pin is the internal error amplifier ’ s output. The voltage range of COMP pin is 0 V to 3 V. Both the
primary-side switches ’ duty cycle and secondary-side SRs ’ duty cycle is controlled by the COMP pin voltage. At
steady state, a higher COMP pin voltage results in a larger duty cycle for the primary-side switches and a smaller
duty cycle on the SRs.
When the UCC28250 controller is set up for secondary-side control, connect the compensation network from the
FB/EA- pin to the COMP pin.
For primary-side control, the error amplifier is connected as a voltage follower. Directly connect the COMP pin to
the FB/EA- pin.
VSENSE (14/1)
The VSENSE pin is used to directly sense the output voltage and to feed it into a transconductance error
amplifier. The measured voltage allows the UCC28250 to achieve optimal pre-biased start up performance.
When configured as a secondary-side controller, the output voltage is sensed and fed into the FB/EA- pin. The
UCC28250 uses a conventional error amplifier approach to allow type III compensation. Therefore, the FB/EA-
pin voltage always follows the REF/EA+ voltage. The FB/EA- pin does not reflect the true output voltage and
therefore this dedicated VSENSE pin is required. The voltage divider connected to VSENSE is discussed in the
Pre-Biased Start-Up Section.
When UCC28250 is set up as primary-side control, connect VSENSE pin to VREF.
Copyright ? 2010 – 2011, Texas Instruments Incorporated
Product Folder Link(s): UCC28250
19
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相关代理商/技术参数 |
参数描述 |
|---|---|
| UCC28250PW | 制造商:Texas Instruments 功能描述:PWM CONTROLLER IC 17V TSSOP-20 制造商:Texas Instruments 功能描述:IC, PWM CONTROLLER, 17V, TSSOP-20 |
| UCC28250PWR | 功能描述:电压模式 PWM 控制器 Adv PWM Controller RoHS:否 制造商:Texas Instruments 输出端数量:1 拓扑结构:Buck 输出电压:34 V 输出电流: 开关频率: 工作电源电压:4.5 V to 5.5 V 电源电流:600 uA 最大工作温度:+ 125 C 最小工作温度:- 40 C 封装 / 箱体:WSON-8 封装:Reel |
| UCC28250PWT | 制造商:TI 制造商全称:Texas Instruments 功能描述:Advanced PWM Controller With Pre-Bias Operation |
| UCC28250RGPR | 功能描述:电压模式 PWM 控制器 Adv PWM Controller RoHS:否 制造商:Texas Instruments 输出端数量:1 拓扑结构:Buck 输出电压:34 V 输出电流: 开关频率: 工作电源电压:4.5 V to 5.5 V 电源电流:600 uA 最大工作温度:+ 125 C 最小工作温度:- 40 C 封装 / 箱体:WSON-8 封装:Reel |
| UCC28250RGPT | 功能描述:电压模式 PWM 控制器 Adv PWM Controller RoHS:否 制造商:Texas Instruments 输出端数量:1 拓扑结构:Buck 输出电压:34 V 输出电流: 开关频率: 工作电源电压:4.5 V to 5.5 V 电源电流:600 uA 最大工作温度:+ 125 C 最小工作温度:- 40 C 封装 / 箱体:WSON-8 封装:Reel |
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