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LM3552 bảng dữ liệu(PDF) 9 Page - Texas Instruments

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LM3552 bảng dữ liệu(HTML) 9 Page - Texas Instruments

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CFTO
SD
T/F
ITO
INTERNAL EN
T/F
INTERNAL EN
VCFTO
VTRIP
EXTERNAL/INTERNAL
FTO
SD / EN
SD / EN
EN
LM3551, LM3552
www.ti.com
SNVS371D – AUGUST 2005 – REVISED MAY 2013
Under-Voltage Protection (UVP)
Both the LM3551 and LM3552 have under-voltage protection circuitry (UVP). This protects the NMOS power
device during startup and shutdown by preventing operation at voltages less than the minimum input voltage.
The UVP protection is enabled at 2.48V(typ.) and will not disable until the input voltage rises above 2.58V(typ.) .
Torch/Flash Pin (T/F)
The TORCH/FLASH pin (T/F) controls whether the LM3551/2 is in continuous torch mode, or in flash mode. A
logic '0' places the part into torch mode and a logic '1' places the part into flash mode. There are no pull-ups or
pull-downs internally connected to T/F. When placed into torch mode, FET-T is enabled allowing the current set
by RT to flow. In torch mode, FET-F is not enabled. Flash mode enables both FET-T and FET-F allowing the sum
total of the current set by the two external resistors, RT and RF, to flow.
Flash Timeout Protection (FTP)
When SD is low(LM3551) or EN is high(LM3552), and T/F is high, a current is output to an external capacitor,
CFTO. This causes the voltage on the capacitor to rise. If the voltage reaches Vtrip (1.16V(typ)), the timeout circuit
forces the INTERNAL_EN signal to go low, which in turn shuts-off the low-side torch and flash FETs in addition
to disabling the main power SW FET. At such time, the LED will be turned off. The part will remain disabled until
SD is pulled high (LM3551) or EN is pulled low (LM3552) and/or T/F is pulled low. At that point, the part will
return to normal operating mode. The diagram below shows a first pulse which exceeds the timeout period and
internal_EN being driven low. The second FLASH pulse is shorter than the timeout period and therefore the
voltage on CFTO never reaches Vtrip. For information on component selection, please see the FLASH TIMEOUT
EQUATIONS below.
TFTO = CFTO × (ΔVFTO ÷ IFTO)
(1)
ΔVFTO = 1.16V and IFTO= 1.4µA TFTO = Desired Timeout Duration
(2)
CFTO(µF) = TFTO(sec.) × 1.21(µA/V)
(3)
To disable the timeout function, ground the FTO pin.
Figure 15. Flash Timeout Protection Diagram
Copyright © 2005–2013, Texas Instruments Incorporated
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