LM3553SDEV National Semiconductor, LM3553SDEV Datasheet - Page 3

• 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: -

Board Operation
BASIC CONNECTIONS
To operate the LM3553 1.2A Dual Flash LED Driver System
with I2C Compatible Interface, connect a supply voltage
(2.7V-5.5V) between board connectors VIN and GND and at-
tach an I
the EXTERNAL CONTROL INTERFACE SECTION of this
document.
Default Jumper Connections:
•
•
M/F: Connected to "-". To enable the LM3553 evaluation
board, connect the M/F header to the '+' using the provided
jumper. This will place the LM3553 evaluation board into
normal operation mode and out of Hardware Reset
TX: Connected to "-". By default, this setting will allow the
full-scale flash to occur. Moving the TX jumper to the "+"
2
C interface using one of the methods described in
FIGURE 4. Bottom Layer (unmirrored)
FIGURE 2. Mid-Layer 1
FIGURE 3. Mid-Layer 2
3
•
With the default jumper connections made, the board will be
ready to operate once an input voltage and an I2C interface
generator (external or USB docking board) are connected.
NOTE: For the evaluation board to work properly, the
OVP bit in the Multi-Function/Options Register must be
set to a 1 (18.9V OVP). If this bit is not enabled, the part
position during a flash will force the LM3553 in a lower
current TX mode. This TX mode level is equal to the level
stored in the Torch Control Register.
FEN: Connected to "-". By default, this setting will not allow
an externally controlled flash even to occur. Moving the
FEN jumper to the "+" position will start a flash event. The
flash event will remain active until the FEN pin is driven
back to the "-" position or the internal timeout time lapses,
which ever occurs first.
30049604
30049605
30049603
www.national.com