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參數資料
| 型號： | TPS5120QDBTRQ1 |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩壓器 |
| 英文描述： | 1.5 A DUAL SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDSO30 |
| 封裝： | PLASTIC, SM8-30 |
| 文件頁數： | 17/21頁 |
| 文件大小： | 320K |
| 代理商： | TPS5120QDBTRQ1 |
TPS5120Q1
DUAL OUTPUT, TWOPHASE SYNCHRONOUS BUCK DC/DC CONTROLLER
SGLS225B JANUARY 2004 REVISED APRIL 2008
5
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
detailed description
switching-mode power supply (SMPS) 1, 2
The TPS5120 includes dual SMPS controllers that operate 180
° out of phase and at the same frequency. Both
channels have standby and softstart.
5-V regulator
An internal linear voltage regulator is used for the high-side driver bootstrap voltage and source of VREF
(0.85 V). When the 5-V regulator is disconnected from the MOSFET drivers, it is only used for the source of
VREF. Since the input voltage range is from 4.5 V to 28 V, this feature offers a fixed voltage for the bootstrap
voltage so that the drive design is much easier. It is also used for powering the low-side driver. The tolerance
is 4%. The 5-V regulator is disabled when STBY1, STBY2, and 5V_STBY are all set low.
5-V switch
If the internal 5-V switch senses the 5-V input from the REG5V_IN pin, the internal 5-V linear regulator is
disconnected from the MOSFET drivers. The external 5 V is then used for both the low-side driver and the
high-side bootstrap, thus, increasing the efficiency.
error amplifier
Each channel has its own error amplifier to regulate the output voltage of the synchronous buck converter. It
is used in the PWM mode for the high output current condition (> 0.2 A). The unity gain bandwidth is 2.5 MHz.
This decreases the amplifier delay during fast load transients and contributes to a fast transient response.
skip comparator
In skip mode, each channel has its own hysteretic comparator to regulate the output voltage of the synchronous
buck converter. The hysteresis is set internally and is typically set at 9 mV. The delay from the comparator input
to the driver output is typically 1.2
s.
low-side driver
The low-side driver is designed to drive low rds(on) N-channel MOSFETs. The maximum drive voltage is 5 V from
VREF5. The current rating of the driver is typically 1.5 A at source and sink.
high-side driver
The high-side driver is designed to drive low rds(on) N-channel MOSFETs. The current rating of the driver is 1.2 A
at source and sink. When configured as a floating driver, the bias voltage to the driver is developed from VREF5,
limiting the maximum drive voltage between OUTx_u and LLx to 5 V. The maximum voltage that can be applied
between LHx and OUTGND is 33 V.
deadtime
Deadtime prevents shoot through current from flowing through the main power FETs during switching transitions
by actively controlling the turnon time of the MOSFETs drivers.
current protection
Overcurrent protection is achieved by comparing the drain-to-source voltage of the high-side and low-side
MOSFET devices to a set-point voltage. This voltage is set using an external resistor between VCC and the
TRIP1 or TRIP2 terminals. If the drain-to-source voltage up exceeds the set-point voltage during high-side
conduction, the current limit circuit terminates the high-side driver pulse. If the set-point voltage is exceeded
during low-side conduction, the low-side pulse is extended through the next cycle. Together this action has the
effect of decreasing the output voltage until the undervoltage protection circuit is activated and the fault latch
is set and both the high and low-side MOSFET drivers are shut off.
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| TPS5120QDBTRQ1G4 | 功能描述:DC/DC 開關控制器 Dual Out 2Ph Synch Buck DC/DC Cntrlr RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數量:1 最大工作溫度:+ 125 C 安裝風格: 封裝 / 箱體:CPAK |
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| TPS51211DSCR | 功能描述:DC/DC 開關控制器 Hi-Perf,Single Synch Step-Down Controller RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數量:1 最大工作溫度:+ 125 C 安裝風格: 封裝 / 箱體:CPAK |
| TPS51211DSCT | 功能描述:DC/DC 開關控制器 Hi-Perf,Single Synch Step-Down Controller RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數量:1 最大工作溫度:+ 125 C 安裝風格: 封裝 / 箱體:CPAK |
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