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| 型號： | TPS53851RHHT |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHING CONTROLLER, PQCC36 |
| 封裝： | PLASTIC, VQFN-36 |
| 文件頁數(shù)： | 14/66頁 |
| 文件大小： | 1264K |
| 代理商： | TPS53851RHHT |
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www.ti.com
SLUS985 – DECEMBER 2009
5.16
PHSEL PIN FAULT
The PHSEL pin is normally terminated with a resistor string, or tied directly to ground. If this string
becomes open, the PHSEL pin voltage is pulled up internally to greater than 4V. The controller enters a
‘Standby’ mode. The upper and lower MOSFETs are turned off but the internal 5V regulator is still active
and VREG is present. If the PHSEL connection is restored, normal operation continues after 64 PWM
clock cycles.
5.17 OVERTEMPERATURE
If the temperature of the controller die is detected to be above 155°C, the upper and lower MOSFETs are
turned off and the 5-V regulator, VREG, is turned off. When the die temperature decreases 30°C the
controller performs a normal start up.
5.18 FAULT MASKING OPERATION
If the TRKx pin voltage is externally limited below the 1.4-V threshold, the controller does not respond to
an Undervoltage fault and the PGOOD output remains low. Other fault modes remain operational. The
overcurrent protection continues to terminate PWM cycle every time the threshold is exceeded, but the
hiccup mode is not entered.
5.19 PROTECTION AND FAULT MODES
There are modes of normal operation during start up and shut down as well various fault modes that may
be detected. It is often necessary to know the state of the upper and lower MOSFETs in these modes.
Table xx shows a summary of these modes and the state of the MOSFETs. A description of each mode
follows the table.
Table 5-1. Fault Mode Summary
MODE
UPPER MOSFET
LOWER MOSFET
Programmable UVLO_CEx = LOW
OFF
Power-On-Reset: fixed UVLO, BP5 < 4.25 V
OFF
Overcurrent
OFF, hiccup mode
Output undervoltage
OFF, hiccup mode
Output overvoltage, prior to PWM switching
OFF
Output overvoltage, while PWM switching
PWM switching
CLKFLT, missing CLKIO at slave
OFF
PHSEL voltage > 4 V, or open to ground
OFF
Overtemperature
OFF
Copyright 2009, Texas Instruments Incorporated
APPLICATION INFORMATION
21
Product Folder Link(s): TPS53851
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