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| 型号： | TPS57040QDGQRQ1 |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHING REGULATOR, 2500 kHz SWITCHING FREQ-MAX, PDSO10 |
| 封装： | GREEN, PLASTIC, MSOP-10 |
| 文件页数： | 5/51页 |
| 文件大小： | 1871K |
| 代理商： | TPS57040QDGQRQ1 |
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SLVSAP4A
– DECEMBER 2010 – REVISED APRIL 2011
DETAILED DESCRIPTION
Fixed Frequency PWM Control
The TPS57040-Q1 uses an adjustable fixed frequency, peak current mode control. The output voltage is
compared through external resistors on the VSENSE pin to an internal voltage reference by an error amplifier
which drives the COMP pin. An internal oscillator initiates the turn on of the high side power switch. The error
amplifier output is compared to the high side power switch current. When the power switch current reaches the
level set by the COMP voltage, the power switch is turned off. The COMP pin voltage will increase and decrease
as the output current increases and decreases. The device implements a current limit by clamping the COMP pin
voltage to a maximum level. The Eco-Mode
is implemented with a minimum clamp on the COMP pin.
Slope Compensation Output Current
The TPS57040-Q1 adds a compensating ramp to the switch current signal. This slope compensation prevents
sub-harmonic oscillations. The available peak inductor current remains constant over the full duty cycle range.
Pulse Skip Eco-Mode
The TPS57040-Q1 operates in a pulse skip Eco mode at light load currents to improve efficiency by reducing
switching and gate drive losses. The TPS57040-Q1 is designed so that if the output voltage is within regulation
and the peak switch current at the end of any switching cycle is below the pulse skipping current threshold, the
device enters Eco mode. This current threshold is the current level corresponding to a nominal COMP voltage or
500mV.
When in Eco-mode, the COMP pin voltage is clamped at 500mV and the high side MOSFET is inhibited. Further
decreases in load current or in output voltage can not drive the COMP pin below this clamp voltage level.
Since the device is not switching, the output voltage begins to decay. As the voltage control loop compensates
for the falling output voltage, the COMP pin voltage begins to rise. At this time, the high side MOSFET is enabled
and a switching pulse initiates on the next switching cycle. The peak current is set by the COMP pin voltage. The
output voltage re-charges the regulated value (see Figure 25), then the peak switch current starts to decrease,
and eventually falls below the Eco mode threshold at which time the device again enters Eco mode.
For Eco mode operation, the TPS57040-Q1 senses peak current, not average or load current, so the load current
where the device enters Eco mode is dependent on the output inductor value. For example, the circuit in
Figure 50 enters Eco mode at about 20 mA of output current. When the load current is low and the output
voltage is within regulation, the device enters a sleep mode and draws only 116
μA input quiescent current. The
internal PLL remains operating when in sleep mode. When operating at light load currents in the pulse skip
mode, the switching transitions occur synchronously with the external clock signal.
Copyright
2010–2011, Texas Instruments Incorporated
13
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相关代理商/技术参数 |
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|---|---|
| TPS57040QDRCRQ1 | 功能描述:直流/直流开关转换器 3.5-42Vin,0.5A Step Down SWIFT Cnvrtr RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
| TPS57060QDGQRQ1 | 功能描述:直流/直流开关转换器 3.5-60Vin,0.5A,2.5 MHz Step Down Cnvrtr RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
| TPS57060QDRCRQ1 | 功能描述:直流/直流开关转换器 3.5-60Vin,0.5A,2.5 MHz Step Down Cnvrtr RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
| TPS57112QRTERQ1 | 功能描述:直流/直流开关转换器 2.95-6Vin,2A,2MHz Sync St Down Cnvrtr RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
| TPS57114EVM | 制造商:Texas Instruments 功能描述:TPS57114EVM - Boxed Product (Development Kits) |
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