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參數資料
| 型號： | TLV62065DSGT |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩壓器 |
| 英文描述： | 2 A SWITCHING REGULATOR, 3400 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封裝： | 2 X 2 MM, 0.75 MM HEIGHT, PLASTIC, WSON-8 |
| 文件頁數： | 5/26頁 |
| 文件大小： | 1182K |
| 代理商： | TLV62065DSGT |
www.ti.com
SLVSAC4 – NOVEMBER 2010
DETAILED DESCRIPTION
OPERATION
The TLV62065 step down converter operates with typically 3MHz 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 use 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 now 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 ramps 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 High Side MOSFET switch.
POWER SAVE MODE
At TLV62065 pulling the Mode pin low enables Power Save Mode. If the load current decreases, the converter
enters 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
converter positions the output voltage typically +1% above the nominal output voltage. This voltage positioning
feature minimizes voltage drops caused by a sudden load step.
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 VOUTnominal +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 with typ. 18A current consumption.
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 due to the load current.
The PFM mode is exited and PWM mode entered in case the output current can no longer be supported in PFM
mode.
Copyright 2010, Texas Instruments Incorporated
13
Product Folder Link(s) :TLV62065
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