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參數資料
| 型號： | TPS62420DRCT |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩壓器 |
| 英文描述： | 1.61 A DUAL SWITCHING CONTROLLER, 2500 kHz SWITCHING FREQ-MAX, PDSO10 |
| 封裝： | 3 X 3 MM, GREEN, PLASTIC, SON-10 |
| 文件頁數： | 6/37頁 |
| 文件大小： | 1020K |
| 代理商： | TPS62420DRCT |
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MODE/DATA
2V/Div
V
OUT1:1.5V
V
OUT1:1.1V
V
IN 3.8V
ACKN=off
I
OUT1 =150mA
REG_DEF_1_Low
V
OUT1:200mV/Div
Timebase-100 s/Div
m
SLVS676C – JUNE 2006 – REVISED JUNE 2010
www.ti.com
VOUT1 CHANGE WITH EASYSCALE
Figure 25.
DETAILED DESCRIPTION
OPERATION
The TPS62420 includes two synchronous step-down converters. The converters operate with typically 2.25MHz
fixed frequency pulse width modulation (PWM) at moderate to heavy load currents. If Power Save Mode is
enabled, the converters automatically enter Power Save Mode at light load currents and operate in 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.
Each converter integrates two current limits, one in the P-channel MOSFET and another one in the N-channel
MOSFET. When the current in the P-channel MOSFET reaches its current limit, the P-channel MOSFET is
turned off and the N-channel MOSFET is turned on. If the current in the N-channel MOSFET is above the
N-MOS current limit threshold, the N-channel MOSFET remains on until the current drops below its current limit.
The two DC-DC converters operate synchronized to each other. A 180° phase shift between converter 1 and
converter 2 decreases the input RMS current.
Converter 1
In the adjustable output voltage version TPS62420 the converter 1 output voltage can be set via an external
resistor network on PIN DEF_1, which operates as an analog input. In this case, the output voltage can be set in
the range of 0.6V to VIN V. The FB1 Pin must be directly connected to the converter 1 output voltage VOUT1. It
feeds back the output voltage directly to the regulation loop.
The output voltage of converter 1 can also be changed by the EasyScale serial Interface. This makes the device
very flexible for output voltage adjustment. In this case, the device uses an internal resistor network.
In the fixed default output voltage version like TPS62421, the DEF_1 Pin is configured as a digital input. The
converter 1 defaults to 1.2V or 1.8V depending on the level of DEF_1 pin. If DEF_1 is low the default is 1.2V; if
high, the default is 1.8V. With the EasyScale interface, the output voltage for each DEF_1 Pin condition (high
or low) can be changed.
14
Copyright 2006–2010, Texas Instruments Incorporated
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| TPS62420DRC | 1.61 A DUAL SWITCHING CONTROLLER, 2500 kHz SWITCHING FREQ-MAX, PDSO10 |
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| TPS62510DRCRG4 | 1.5 A SWITCHING REGULATOR, 1700 kHz SWITCHING FREQ-MAX, PDSO10 |
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相關代理商/技術參數 |
參數描述 |
|---|---|
| TPS62420DRCT | 制造商:Texas Instruments 功能描述:DC/DC Converter IC 制造商:Texas Instruments 功能描述:IC, DUAL STEP-DOWN CONVERTER, SON-10 |
| TPS62420DRCTG4 | 功能描述:直流/直流開關調節器 Dual Adj 600mA & 1000mA 2.25MHz RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數量: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
| TPS62420EVM-167 | 功能描述:電源管理IC開發工具 STEP DOWN CONVERTER RoHS:否 制造商:Maxim Integrated 產品:Evaluation Kits 類型:Battery Management 工具用于評估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V |
| TPS62420QDRCRQ1 | 功能描述:直流/直流開關調節器 Dual,Adj,600mA&1000 mA,2.25MHz Step-Down RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數量: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
| TPS62421DRCR | 功能描述:直流/直流開關轉換器 2.25MHz 600mA/1000 mA Dual Step Down RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數量:2 最大工作溫度:+ 85 C 安裝風格:SMD/SMT |
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