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參數(shù)資料
| 型號(hào)： | TPS5401DGQT |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHING REGULATOR, 2500 kHz SWITCHING FREQ-MAX, PDSO10 |
| 封裝： | PLASTIC, MSOP-10 |
| 文件頁數(shù)： | 4/41頁 |
| 文件大?。?/td> | 1149K |
| 代理商： | TPS5401DGQT |
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SLVSAB0 – DECEMBER 2010
www.ti.com
DETAILED DESCRIPTION
Fixed Frequency PWM Control
The TPS5401 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 turnon 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 increases and decreases 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 control scheme is implemented with a minimum clamp on the COMP pin.
Slope Compensation Output Current
The TPS5401 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 Control Scheme
The TPS5401 operates in a pulse-skip Eco-mode control scheme at light load currents to improve efficiency by
reducing switching and gate-drive losses. The TPS5401 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 the Eco-mode control scheme. This current threshold is the current level
corresponding to a nominal COMP voltage of 500 mV.
When in the Eco-mode control scheme, the COMP pin voltage is clamped at 500 mV, and the high-side
MOSFET is inhibited. Further decreases in load current or increases in output voltage cannot drive the COMP
pin below this clamp voltage level.
Because 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 recharges the regulated value (see Figure 25); then the peak switch
current starts to decrease and eventually falls below the Eco-mode control-scheme threshold, at which time the
device again enters the Eco-mode control scheme.
For Eco-mode control-scheme operation, the TPS5401 senses peak current, not average or load current, so the
load current where the device enters the Eco-mode control scheme is dependent on the output inductor value.
For example, the circuit in Figure 40 enters the Eco-mode control scheme 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 mA of 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.
12
Copyright 2010, Texas Instruments Incorporated
Product Folder Link(s): TPS5401
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