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参数资料
| 型号： | TPS62700YZFR |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | 1.2 A SWITCHING REGULATOR, 2300 kHz SWITCHING FREQ-MAX, BGA8 |
| 封装： | LEAD FREE, WCSP-8 |
| 文件页数： | 21/25页 |
| 文件大小： | 856K |
| 代理商： | TPS62700YZFR |
PARAMETER MEASUREMENT INFORMATION
V
IN
PVIN
AVIN
PGND
AGND
FB
VCON
EN
SW
3.3
H
m
4.7
F/10
F
m
10
F
m
V
OUT
L:LPS40183.3 H,DCR70m /VLF3014A 3.3 HDCR150m
C
:GRM188R60J106M10 FMurata0603size
m
W
m
W
m
IN
C
:GRM188R60J106M10 FMurata0603size
OUT
m
GRM188Ru60J475K4.7 FMurata0603size
m
DETAILED DESCRIPTION
OPERATION
Dynamic Output Voltage Control VCON
100% Duty Cycle Low Dropout Operation
www.ti.com................................................................................................................................................... SLVS784B – DECEMBER 2007 – REVISED JUNE 2008
The TPS6270x step down converter operates at a 2.0-MHz fixed frequency using pulse-width modulation (PWM)
over the entire load range. This ensures low output-voltage ripple for RF-PA power applications.
In PWM operation, the converter uses a unique fast-response voltage-mode control scheme 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
turns off the switch. The current limit comparator also turns off the switch when the current limit of the High-Side
MOSFET switch is exceeded. After a short dead time to prevent shoot-through, the Low-Side MOSFET rectifier
is turned on, and the inductor current ramps down. The current then flows from the inductor to the output
capacitor and to the load. It turns back to the inductor through the Low-Side MOSFET rectifier.
The next cycle is initiated by the clock signal turning off the Low-Side MOSFET rectifier and turning on the
High-Side MOSFET switch.
The output voltage of TPS6270x can be dynamically adjusted with an external analog voltage applied to the pin
VCON. This voltage is typically supplied from an external DAC to adjust the supply voltage for the RF Power
amplifier, and therefore to determine the RF output power. The output voltage is set to : VOUT = 2.5 x VCON.
The output voltage can be set in the range between VFB, MIN (1.3 V) and VFB, MAX (3.09 V). The device provides
an internal voltage gain factor of 2.5. For dynamic voltage adjustment the VCON voltage range is between VCON,
MIN (0.52 V) and VCON, MAX (1.24 V). In Case the VCON voltage is out of this range, the output voltage is internally
limited to VFB, MIN (1.3 V) and VFB, MAX (3.09 V). This allows using the TPS6270x as a fixed output voltage
converter where the VCON Pin is connected, for example, to GND or VIN.
The device starts to enter 100% duty-cycle mode when the input voltage approaches the nominal output voltage.
In order to maintain the output voltage, the High-Side MOSFET switch is turned on 100% for one or more cycles.
Copyright 2007–2008, Texas Instruments Incorporated
5
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