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| 型号： | TPS65055RSMR |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | 1.8 A DUAL SWITCHING CONTROLLER, 2475 kHz SWITCHING FREQ-MAX, PQCC32 |
| 封装： | 4 X 4 MM, GREEN, PLASTIC, QFN-32 |
| 文件页数： | 9/41页 |
| 文件大小： | 1276K |
| 代理商： | TPS65055RSMR |
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V
=3.6Vto4.2Vto3.6V
T =25°C
TEST CONDITIONS
IN
A
LoadCurrent=100mA
VLDO1=1.2V
CH1:VINLDO1(Black)
CH2:VLDO1(Green)
DETAILED DESCRIPTION
OPERATION
DCDC1 Converter
DCDC2 Converter
www.ti.com.......................................................................................................................................................................................... SLVS844 – SEPTEMBER 2008
Figure 19. Line Transient Response LDO1
The TPS65055 includes two synchronous step-down converters. The converters operate with typically 2.25 MHz
fixed frequency pulse width modulation (PWM) at moderate to heavy load currents. At light load currents the
converters automatically enter power save mode and operate with PFM (pulse frequency modulation).
During PWM operation the converters 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 P-channel MOSFET switch is
turned on and the inductor current ramps up until the comparator trips and the control logic turns off the switch.
The current limit comparator also turns off the switch in case the current limit of the P-channel switch is
exceeded. After the adaptive dead time preventing shoot through current, the N-channel MOSFET rectifier is
turned on and the inductor current ramps down. The next cycle is initiated by the clock signal again turning off
the N-channel rectifier and turning on the P-channel switch.
The two dc-dc converters operate synchronized to each other, with converter 1 as the master. A 180° phase shift
between converter 1 and converter 2 decreases the input RMS current. Therefore smaller input capacitors can
be used.
The converter 1 output voltage is set by the status of the DEFLDO1 and DEFLDO2 pins. The pins can be pulled
low, pulled high or left floating to allow 9 different logic states. See the description for the LDOs for further
details. With the TPS65055 it is also possible to change the output voltage of converter DCDC1 via the I2C
compatible interface. The VDCDC1 pin must be directly connected to VOUT1 and no external resistor network may
be connected.
The VDCDC2 pin must be directly connected to the DCDC2 converter output voltage. The DCDC2 converter
output voltage can be selected via the DEFDCDC2 pin or the I2C compatible interface.
Copyright 2008, Texas Instruments Incorporated
17
Product Folder Link(s): TPS65055
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