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參數(shù)資料
| 型號： | TB7102AF(TE85L,F) |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHING REGULATOR, 1150 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封裝： | 3 X 3 MM, 0.65 MM PITCH, PLASTIC, SON-8 |
| 文件頁數(shù)： | 16/17頁 |
| 文件大?。?/td> | 253K |
| 代理商： | TB7102AF(TE85L,F) |
TB7102AF
2009-10-26
8
Undervoltage Lockout (UVLO)
The TB7102AF has undervoltage lockout (UVLO) protection circuitry. The TB7102AF does not provide output
voltage (VOUT) until the input voltage has reached VUVR (2.5 V typ.). UVLO has hysteresis of 0.1 V (typ.). After
the switch turns on, if VIN drops below VUV (2.4 V typ.), UVLO shuts off the switch at VOUT.
Figure 4 Undervoltage Lockout Operation
Thermal Shutdown (TSD)
The TB7102AF provides thermal shutdown. When the junction temperature continues to rise and reaches TSD
(160°C typ.), the TB7102AF goes into thermal shutdown and shuts off the power supply. TSD has a hysteresis of
about 20°C. The device is enabled again when the junction temperature has dropped by approximately 20°C from
the TSD trip point. The device resumes the power supply when the soft-start circuit is used upon recovery from
the TSD state .
Thermal shutdown is intended to protect the device against abnormal system conditions. It should be ensured
that the TSD circuit will not be activated during normal operation of the system.
Figure 5 Thermal Shutdown Operation
Soft start
TSD Detection threshold: TSD
GND
Switching operation stops
Recovery from TSD
Switching operation starts
VOUT
0
Tj
Hysteresis:
ΔTSD
Soft start
VIN
Hysteresis:
ΔVUV
Undervoltage lockout
detection voltage: VUV
Switching operation stops
GND
VOUT
GND
Undervoltage lockout
recovery voltage: VUVR
Switching operation starts
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