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參數(shù)資料
| 型號(hào)： | TPS40192DRCTG4 |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHING CONTROLLER, 700 kHz SWITCHING FREQ-MAX, PDSO10 |
| 封裝： | 3 X 3 MM, GREEN, PLASTIC, SON-10 |
| 文件頁數(shù)： | 9/38頁 |
| 文件大小： | 707K |
| 代理商： | TPS40192DRCTG4 |
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SLUS719C – MARCH 2007 – REVISED AUGUST 2010
Pre-Bias Startup
The TPS40192/3 contains a unique circuit to prevent current from being pulled from the output during startup in
the condition the output is pre-biased. When the soft-start commands a voltage higher than the pre-bias level
(internal soft-start becomes greater than feedback voltage [VFB]), the controller slowly activates synchronous
rectification by starting the first LDRV pulses with a narrow on-time. It then increments that on-time on a
cycle-by-cycle basis until it coincides with the time dictated by (1-D), where D is the duty cycle of the converter.
This scheme prevents the initial sinking of the pre-bias output, and ensures that the out voltage (VOUT) starts and
ramps up smoothly into regulation and the control loop is given time to transition from pre-biased startup to
normal mode operation with minimal disturbance to the output voltage. The amount of time from the start of
switching until the low-side MOSFET is turned on for the full (1-D) interval is defined by 32 clock cycles.
Drivers
The drivers for the external HDRV and LDRV MOSFETs are capable of driving a gate-to-source voltage of 5 V.
The LDRV driver switches between VDD and GND, while HDRV driver is referenced to SW and switches
between BOOT and SW. The drivers have non-overlapping timing that is governed by an adaptive delay circuit to
minimize body diode conduction in the synchronous rectifier. The drivers are capable of driving MOSFETS that
are appropriate for a 15-A (TPS40192) or 20A (TPS40193) converter.
Power Good
The TPS40192/3 provides an indication that output power is good for the converter. This is an open drain signal
and pulls low when any condition exists that would indicate that the output of the supply might be out of
regulation. These conditions include:
VFB is more than ±10% from nominal
soft-start is active
an undervoltage condition exists for the device
a short circuit condition has been detected
die temperature is over (145°C)
NOTE
When there is no power to the device, PGOOD is not able to pull close to GND if an
auxiliary supply is used for the power good indication. In this case, a built in resistor
connected from drain to gate on the PGOOD pull down device makes the PGOOD pin
look approximately like a diode to GND.
Thermal Shutdown
If the junction temperature of the device reaches the thermal shutdown limit of 145°C, the PWM and the oscillator
are turned off and HDRV and LDRV are driven low, turning off both FETs. When the junction cools to the
required level (125°C nominal), the PWM inititates soft start as during a normal power up cycle.
Copyright 2007–2010, Texas Instruments Incorporated
17
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TPS40192EVM-001 | 功能描述:電源管理IC開發(fā)工具 TPS40192 Evaluation Module RoHS:否 制造商:Maxim Integrated 產(chǎn)品:Evaluation Kits 類型:Battery Management 工具用于評(píng)估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V |
| TPS40192EVM-525 | 功能描述:電源管理IC開發(fā)工具 TPS40192EVM-525 Eval mod RoHS:否 制造商:Maxim Integrated 產(chǎn)品:Evaluation Kits 類型:Battery Management 工具用于評(píng)估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V |
| TPS40193 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:4.5-V TO 18-V INPUT 10-PIN SYNCHRONOUS BUCK CONTROLLER WITH POWER GOOD |
| TPS40193DRCR | 功能描述:DC/DC 開關(guān)控制器 4.5V-8V Input Synch Buck Contr RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK |
| TPS40193DRCRG4 | 功能描述:DC/DC 開關(guān)控制器 4.5V-18V Input Synch Buck Cntrlr RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK |
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