参数资料
| 型号： | TPS51217DSCR |
| 厂商： | Texas Instruments |
| 文件页数： | 12/29页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM 10-SON |
| 标准包装： | 1 |
| 系列： | D-CAP™ |
| PWM 型： | 控制器 |
| 输出数： | 1 |
| 频率 - 最大： | 368kHz |
| 占空比： | 89% |
| 电源电压： | 4.5 V ~ 6.5 V |
| 降压： | 是 |
| 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 ~ 85°C |
| 封装/外壳： | 10-WFDFN 裸露焊盘 |
| 包装： | 标准包装 |
| 其它名称： | 296-28856-6 |
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SLUS947B – JUNE 2009 – REVISED APRIL 2012
APPLICATION INFORMATION
GENERAL DESCRIPTION
The TPS51217 is a high-efficiency, single channel, synchronous buck regulator controller suitable for low output
voltage point-of-load applications in notebook computers and similar digital consumer applications. The device
features proprietary D-CAP? mode control combined with adaptive on-time architecture. This combination is
ideal for building modern low duty ratio, ultra-fast load step response DC/DC converters. The output voltage
ranges from 0.6 V to 2.6 V. The conversion input voltage range is from 3 V to 28 V. The D-CAP? mode uses the
ESR of the output capacitor(s) to sense current information. An advantage of this control scheme is that it does
not require an external phase compensation network, helping the designer with ease-of-use and realizing low
external component count configuration. Adaptive on-time control tracks the preset switching frequency over a
wide range of input and output voltages, while it increases the switching frequency at step-up of load.
The strong gate drivers of the TPS51217 allow low R DS(on) FETs for high current applications.
ENABLE AND SOFT START
When the EN pin voltage rises above the enable threshold, (typically 1.2 V) the controller enters its start-up
sequence. The first 250 μ s is a standby phase. Switching is inhibited during this phase. In the second phase,
internal DAC starts ramping up the reference voltage from 0 V to 0.6 V. This ramping time is 650 μ s. Smooth and
constant ramp up of the output voltage is maintained during start up regardless of load current. Connect a 1-k ?
resistor in series with the EN pin to provide protection.
ADAPTIVE ON-TIME D-CAP? CONTROL
TPS51217 does not have a dedicated oscillator that determines switching frequency. However, the device runs
with pseudo-constant frequency by feed-forwarding the input and output voltages into its on-time one-shot timer.
The adaptive on-time control adjusts the on-time to be inversely proportional to the input voltage and proportional
to the output voltage (t ON ∝ V OUT / V IN ). This makes the switching frequency fairly constant in steady state
conditions over wide input voltage range.
The off-time is modulated by a PWM comparator. The VFB node voltage (the mid point of resistor divider) is
compared to the internal 0.6-V reference voltage added with a ramp signal. When both signals match, the PWM
comparator asserts the set signal to terminate the off-time (turn off the low-side MOSFET and turn on high-side
MOSFET). The set signal becomes valid if the inductor current level is below OCP threshold, otherwise the off-
time is extended until the current level to become below the threshold.
12
Copyright ? 2009–2012, Texas Instruments Incorporated
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相关代理商/技术参数 |
参数描述 |
|---|---|
| TPS51217DSCT | 功能描述:DC/DC 开关控制器 3-28V Input 20A Synch St Down Cntrlr RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| TPS51217EVM-533 | 功能描述:电源管理IC开发工具 TPS51217 Eval Module 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 |
| TPS51218 | 制造商:TI 制造商全称:Texas Instruments 功能描述:HIGH PERFORMANCE, SINGLE SYNCHRONOUS STEP-DOWN CONTROLLER FOR NOTEBOOK POWER SUPPLY |
| TPS51218DSCR | 功能描述:DC/DC 开关控制器 3-28V In,20A Synch Step Down Cntrlr RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| TPS51218DSCT | 功能描述:DC/DC 开关控制器 3-28V In,20A Synch Step Down Cntrlr RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
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