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參數(shù)資料
| 型號(hào)： | TPS62751DSKR |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 1.8 A SWITCHING REGULATOR, 2500 kHz SWITCHING FREQ-MAX, PDSO10 |
| 封裝： | 2.50 X 2.50 MM, GREEN, PLASTIC, SON-10 |
| 文件頁數(shù)： | 7/30頁 |
| 文件大小： | 1733K |
| 代理商： | TPS62751DSKR |
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www.ti.com ................................................................................................................................................. SLVS955A – JULY 2009 – REVISED SEPTEMBER 2009
DETAILED DESCRIPTION
OPERATION
The TPS6275x step down converter operates with typically 2.25MHz fixed frequency pulse width modulation
(PWM) at moderate to heavy load currents. At light load currents the converter can automatically enter Power
Save Mode and operates then in PFM (Pulse Frequency Mode) mode.
During PWM operation, the converter uses a unique fast response voltage mode controller scheme with input
voltage feed-forward to achieve good line and load regulation allowing the use of small ceramic input and output
capacitors. At the beginning of each clock cycle initiated by the clock signal, the High Side MOSFET switch is
turned on. The current flows from the input capacitor via the High Side MOSFET switch through the inductor to
the output capacitor and load. During this phase, the current ramps up until the PWM comparator trips and the
control logic will turn off the switch.
The current limit comparator will also turn off the switch in case the current limit of the High Side MOSFET switch
is exceeded. After a dead time preventing shoot through current, the Low Side MOSFET rectifier is turned on
and the inductor current will ramp down. The current flows now from the inductor to the output capacitor and to
the load. It returns back to the inductor through the Low Side MOSFET rectifier.
The next cycle will be initiated by the clock signal again turning off the Low Side MOSFET rectifier and turning on
the on the High Side MOSFET switch.
POWER SAVE MODE
If the load current decreases, the converter will enter Power Save Mode operation automatically. During Power
Save Mode the converter skips switching and operates with reduced frequency in PFM mode with a minimum
quiescent current to maintain high efficiency.
The transition from PWM mode to PFM mode occurs once the inductor current in the Low Side MOSFET switch
becomes zero, which indicates discontinuous conduction mode.
During the Power Save Mode the output voltage is monitored with a PFM comparator. As the output voltage falls
below the PFM comparator threshold of VOUT nominal +1%, the device starts a PFM current pulse. For this the
High Side MOSFET switch will turn on and the inductor current ramps up. After the On-time expires the switch
will be turned off and the Low Side MOSFET switch will be turned on until the inductor current becomes zero.
The converter effectively delivers a current to the output capacitor and the load. If the load is below the delivered
current the output voltage will rise. If the output voltage is equal or higher than the PFM comparator threshold,
the device stops switching and enters a sleep mode.
In case the output voltage is still below the PFM comparator threshold, further PFM current pulses will be
generated until the PFM comparator threshold is reached. The converter starts switching again once the output
voltage drops below the PFM comparator threshold.
With a fast single threshold comparator, the output voltage ripple during PFM mode operation can be kept very
small. The PFM Pulse is timing controlled, which allows to modify the charge transferred to the output capacitor
by the value of the inductor. The resulting PFM output voltage ripple depends in first order on the size of the
output capacitor and the inductor value. Increasing output capacitor values and/or inductor values will minimize
the output ripple.
The PFM mode is left and PWM mode entered in case the output current can not longer be supported in PFM
mode.
ENABLE
The device is enabled setting EN pin to high. During the start up time tstart-up the internal circuits are settled.
Afterwards the device activates the soft start circuit. The EN input can be used to control power sequencing in a
system with various DC/DC converters.
The EN pin can be connected to the output of another converter, to drive the EN pin high and getting a
sequencing of supply rails. With EN = GND, the device enters shutdown mode. In this mode, all circuits are
disabled. In fixed output voltage versions, the internal resistor divider network is disconnected from FB pin.
Copyright 2009, Texas Instruments Incorporated
15
Product Folder Link(s) :TPS62750, TPS62751
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