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| 型号： | TPS65131RGETG4 |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | 2.2 A SWITCHING REGULATOR, 1500 kHz SWITCHING FREQ-MAX, PQCC24 |
| 封装： | 4 X 4 MM, GREEN, PLASTIC, QFN-24 |
| 文件页数： | 14/34页 |
| 文件大小： | 785K |
| 代理商： | TPS65131RGETG4 |
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Power Conversion
Control
Power-Save Mode
Enable
Load Disconnect
TPS65130, TPS65131
SLVS493B – MARCH 2004 – REVISED SEPTEMBER 2004
DETAILED DESCRIPTION (continued)
Both converters operate in a fixed-frequency, PWM control scheme. So, the on-time of the switches varies
depending on input-to-output voltage ratio and the load. During this on-time, the inductors connected to the
converters are charged with current. In the remaining time, the time period set by the fixed operating frequency,
the inductors discharge into the output capacitors via the rectifier diodes. Usually at higher loads, the inductor
currents are continuous. At lighter loads, the boost converter uses an additional internal switch to allow current
flowing back to the input. This avoids inductor current becoming discontinuous in the boost converter. So, the
boost converter is always controlled in a continuous current mode. At the inverting converter, during light loads,
the inductor current can become discontinuous. In this case, the control circuit of the inverting controller output
automatically takes care of these changing conditions to always operate with an optimum control setup.
The controller circuits of both converters are based on a fixed-frequency, multiple-feedforward controller
topology. Input voltage, output voltage, and voltage drop across the switches are monitored and forwarded to the
regulator. Changes in the operating conditions of the converters directly affect the duty cycle and must not take
the indirect and slow way through the output voltage control loops. Measurement errors in this feedforward
system are corrected by a self-learning control system. To avoid output voltage steps due to output changes of
this self-learning control system, its output is dampened by an external capacitor.
The voltage loops, determined by the error amplifiers, only have to handle small signal errors. The error
amplifiers are internally compensated. Their inputs are the feedback voltages on the FBP and FBN pins. These
voltages are compared with the internal reference voltage to generate an accurate and stable output voltage.
The PSN and PSP can be used to select different operating modes. To enable power-save mode for the
corresponding converter, the dedicated PS pin must be set high. Power-save mode can be used to improve
efficiency at light load. In power-save mode, the converter only operates when the output voltage falls below a
set threshold voltage. It ramps up the output voltage with one or several operating pulses and goes again into
power-save mode once the inductor current goes discontinuous. The power-save mode can be disabled
seperately for each converter by setting the corresponding PS pin low.
Applying a low signal at the enable ENP or ENN pins shuts down the corresponding converter. When both
enable pins are tied low, the device enters shutdown mode, where all internal circuitry is turned off. The device
now just consumes low shutdown current flowing into the VIN pin. The output loads of the converters are
disconnected from the battery as described in the following paragraph. Pulling the enable pins high enables the
corresponding converter. Internal circuitry, necessary to operate the specific converter, is then turned on.
The device supports completely disconnecting the load, when the converters are disabled. At the inverting
converter, this is done by just turning off the internal PMOS switch. If the inverting converter is turned off, no DC
current path remains which could discharge the battery. This is different at the boost converter. The external
rectifying diode, together with the boost inductor, form a DC current path which could discharge the battery if any
load is connected at the output. The device has no internal switch to prevent current from flowing. For this
reason, a PMOS gate control output (BSW) is implemented. A PMOS switch can be placed into this DC current
path, ideally, directly between the boost inductor and battery. To be able to really disconnect the battery, the
forward direction of the parasitic backgate diode of this switch must point to the battery. The external PMOS
switch, connected to BSW, turns on when the boost converter is enabled and is turned off when the boost
converter is disabled.
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相关代理商/技术参数 |
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| TPS65131TRGERQ1 | 制造商:Texas Instruments 功能描述:IC REG BST INV ADJ 2A DL 24VQFN 制造商:Texas Instruments 功能描述:TPS65131TRGERQ1 |
| TPS65132A0YFFR | 制造商:Texas Instruments 功能描述:DUAL OUTPUT LCD BIAS |
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| TPS65132B0YFFR | 制造商:Texas Instruments 功能描述:DUAL OUTPUT LCD BIAS |
| TPS65132B2YFFR | 功能描述:DUAL OUTPUT LCD BIAS 15DSBGA 制造商:texas instruments 系列:- 包装:剪切带（CT） 零件状态:有效 显示类型:LCD，OLED 配置:- 接口:I2C 数字或字符:- 电流 - 电源:540μA 电压 - 电源:2.5 V ~ 5.5 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:15-UFBGA，DSBGA 供应商器件封装:15-DSBGA 标准包装:1 |
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