LM3553SDEV National Semiconductor, LM3553SDEV Datasheet - Page 9

• Manufacturer Part Number: LM3553SDEV
• Description: BOARD EVALUATION FOR LM3553S
• Manufacturer: National Semiconductor
• Series: PowerWise®r

Specifications of LM3553SDEV

• Current - Output / Channel: 1.2A
• Outputs And Type: 1, Non-Isolated
• Features: Camera Flash and Torch Modes, I²C Interface, Programmable Output Current
• Voltage - Input: 2.7 ~ 5.5V
• Utilized Ic / Part: LM3553
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Voltage - Output: -

•
•
•
•
•
•
VFB: Toggles the Feedback voltage between 450mV
(default) and 350mV. When pressed, the feedback voltage
will be set to 350mV
Volt Mode: Places the LM3553 into voltage output mode.
When depressed, the part will output 4.98V.
EN1 and EN0: These bits place the part into either
shutdown, indicator, torch or flash. '00' = Shutdown,
'01'=Indicator, '10'=Torch, '11'=Flash.
OCL: Toggles the inductor current limit between 2.5A
(default) and 1.7A. When the OCL button is depressed,
the current limit will be set to 1.7A
OVP: Toggles the over-voltage protection level between
5.6V (default) and 18.9V. When the OVP button is
depressed, the OVP level will be set to 18.9V
Data, I/O, HWEN: These buttons control the functionality
of the M/F pin. Please refer to the M/F pin description for
a detailed description of the M/F pin operation.
30049625
30049627
9
•
•
•
•
•
•
•
Note: If the part is enabled to any level of brightness or state and the pro-
Flash: Starts a Flash event by setting the EN1 and EN0
bits to 1's.
Torch: Starts a Torch event by setting the EN1 bit to a '1'
and EN 0 bit to a '0'.
Indicator: Starts an Indicator event by setting the EN1 bit
to a '0' and EN 0 bit to a '1'.
Disable: Shuts down the LM3553 by setting the EN1 and
EN0 bits to 0's.
Torch Slider: Sets the Torch brightness to any allowable
brightness code (0 to 31)
Flash Slider: Sets the Flash brightness to any allowable
brightness code (0 to 127)
Flash Duration: Sets the Flash duration to one of the 16
built-in time durations (0 to 15)
gram is closed (by either hitting the OK or cancel buttons) , the
LM3553 part will remain in the last controlled state.
www.national.com
30049626