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參數(shù)資料
| 型號： | TPS5300DAPR |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 3.3 A SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDSO32 |
| 封裝： | GREEN, PLASTIC, HTSSOP-32 |
| 文件頁數(shù)： | 5/23頁 |
| 文件大?。?/td> | 476K |
| 代理商： | TPS5300DAPR |
TPS5300
SLVS334A DECEMBER 2000 REVISED SEPTEMBER 2001
13
www.ti.com
detailed description (continued)
low-side driver
The low-side driver is designed to drive low rds(on), N-channel MOSFETs. The current of the driver is typically
2-A source and 3.3-A sink. The supply to the low-side driver is internally connected to VCC.
high-side driver
The high-side driver is designed to drive low rds(on) N-channel MOSFETs. The current of the driver is typically
2-A source and 3.3-A sink. The high-side driver is configured as a floating bootstrap driver. The internal
bootstrap diode, connected between the DRV and BOOT pins, is a Schottky diode for improved drive efficiency.
The maximum voltage that can be applied between the BOOT pin and ground is 35 V.
deadtime control
The deadtime control prevents shoot-through current from flowing through the main power FET’s during the
switching transitions by actively controlling the turnon times of the MOSFET drivers. The high-side driver is not
allowed to turn on until the gate drive voltage to the low-side FET is below 1.7 V. The low-side driver is not
allowed to turn on until the gate drive voltage from the high-side FET to PH is below 1.3 V.
current sensing
Current sensing is achieved by sensing the voltage across a current-sense resistor placed in series between
the output inductor and the output capacitors. The sensing network consists of a high bandwidth differential
amplifier with a gain of 25x to allow using sense resistors with values as low as 1 m
. Sensing occurs at all times
to allow having real-time information for quick response during an active voltage droop positioning transition.
The voltage on the IOUT pin equals 25 times the sensed voltage.
VR_ON
The VR_ON terminal is a TTL compatible digital pin that is used to enable the controller. When VR_ON is low,
the output drivers are low, the linear regulator drivers are off, and the slowstart capacitor is discharged. When
VR_ON goes high, the short across the slowstart capacitor is released and normal converter operation begins.
When the system logic supply is connected to the VR_ON pin, the VR_ON pin can control power sequencing
by locking out controller operation until the system logic supply exceeds the input threshold voltage of the
VR_ON circuit. Thus, VCC and the system logic supply (either 5 V or 3.3 V) must be above UVLO thresholds
before the controller is allowed to start up. Likewise, a microprocessor or other external logic can also control
the sequencing through VR_ON.
VBIAS undervoltage lockout
The VBIAS undervoltage-lockout circuit disables the controller, while VBIAS is below the 4.46-V start threshold
during power up. The controller is disabled when VBIAS goes below 3.3 V. While the controller is disabled, the
output drivers will be low and the slowstart capacitor will be shorted. When VBIAS exceeds the start threshold,
the short across the slowstart capacitor is released and normal converter operation begins.
IO linear regulator driver
The IO linear regulator driver circuit drives a high power NPN external power transistor, allowing external power
dissipation. The IO voltage is ramped up with the slowstart with the other two converters. Under voltage
protection protects against hard shorts or extreme loading. The VSENSE_IO voltage is monitored by the VGATE
(powergood) circuit. A fault or shutdown on any converter will shut down the linear regulator.
CLK linear regulator driver
The CLK linear regulator driver circuit drives a lower power NPN external power transistor, allowing external
power dissipation. The CLK voltage is ramped up with the slowstart with the other two converters. Under voltage
protection protects against hard shorts or extreme loading. The VSENSE_CLK voltage is monitored by the
VGATE (powergood) circuit. A fault or shutdown on any converter will shut down the linear regulator.
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