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參數(shù)資料
| 型號： | TPS54062DGKR |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHING REGULATOR, 400 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封裝： | PLASTIC, MSOP-8 |
| 文件頁數(shù)： | 3/30頁 |
| 文件大?。?/td> | 745K |
| 代理商： | TPS54062DGKR |
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V
0.8 V
OUT
R
= R
HS
LS
0.8 V
-
÷
÷
è
EN
VENA
i1
ihys
VIN
TPS54062
Ruvlo1
Ruvlo 2
SLVSAV1
– MAY 2011
DETAILED DESCRIPTION
Fixed Frequency PWM Control
The TPS54062 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.
Slope Compensation Output Current
The TPS54062 adds a compensating ramp to the switch current signal. This slope compensation prevents
sub-harmonic oscillations.
Error Amplifier
The TPS54062 has a transconductance amplifier for the error amplifier. The error amplifier compares the
VSENSE voltage to the lower of the internal slow start voltage or the internal 0.8V voltage reference. The
transconductance (gm) of the error amplifier is 102
A/V during normal operation. During the slow start operation,
the transconductance is a fraction of the normal operating gm. The frequency compensation components
(capacitor, series resistor and capacitor) are added to the COMP pin to ground.
Voltage Reference
The voltage reference system produces a precise
±2 voltage reference over temperature by scaling the output of
a temperature stable band-gap circuit
Adjusting the Output Voltage
The output voltage is set with a resistor divider from the output node to the VSENSE pin. It is recommended to
use 1% tolerance or better divider resistors. Start with a 10k
calculate RHS.
(1)
Enable and Adjusting Undervoltage Lockout
The TPS54062 is enabled when the VIN pin voltage rises above 4.53V. If an application requires a higher
undervoltage lockout (UVLO), use the EN pin as shown in Figure 18 to adjust the input voltage UVLO by using
the two external resistors. Though it is not necessary to use the UVLO adjust registers, for operation it is highly
recommended to provide consistent power up behavior. The EN pin has an internal pull-up current source, I1, of
1.2
A that provides the default condition of the TPS54062 operating when the EN pin floats. Once the EN pin
voltage exceeds 1.24V, an additional 3.5
A of hysteresis, Ihys, is added. This additional current facilitates input
voltage hysteresis. When the EN pin is pulled below 1.14V, the 3.5
A is removed. Use Equation 2 to set the
external hysteresis for the input voltage. Use Equation 3 to set the input stop voltage.
Figure 18. Adjustable Undervoltage Lock Out
Copyright
2011, Texas Instruments Incorporated
11
Product Folder Link(s): TPS54062
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| TPS54073 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:2.2 ?4 -V, 14-A SYNCHRONOUS BUCK CONVERTER WITH DISABLED SINKING DURING START-UP |
| TPS54073EVM-098 | 功能描述:電源管理IC開發(fā)工具 14A DC/DC Conv Mod RoHS:否 制造商:Maxim Integrated 產(chǎn)品:Evaluation Kits 類型:Battery Management 工具用于評估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V |
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