LP5520TL/NOPB National Semiconductor, LP5520TL/NOPB Datasheet - Page 8
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LP5520TL/NOPB
Manufacturer Part Number
LP5520TL/NOPB
Description
IC LED DRIVER RGB 25-USMD
Manufacturer
National Semiconductor
Series
PowerWise®r
Type
RGB LED Driverr
Datasheet
1.LP5520TLNOPB.pdf
(34 pages)
Specifications of LP5520TL/NOPB
Constant Current
Yes
Topology
PWM, Step-Up (Boost)
Number Of Outputs
3
Internal Driver
Yes
Type - Primary
Backlight, Light Management Unit (LMU)
Type - Secondary
RGB, White LED
Frequency
1.22kHz, 19.52kHz
Voltage - Supply
2.9 V ~ 5.5 V
Voltage - Output
5 V ~ 20 V
Mounting Type
Surface Mount
Package / Case
25-MicroSMD
Operating Temperature
-30°C ~ 85°C
Current - Output / Channel
60mA
Internal Switch(s)
Yes
Efficiency
87%
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Other names
LP5520TLTR
www.national.com
START-UP SEQUENCE
RESET:
STANDBY:
STARTUP:
BOOST STARTUP: Soft start for boost output is generated in the BOOST STARTUP mode. The boost output is raised in PWM
NORMAL:
In the RESET mode all the internal registers are reset to the default values and the chip goes to STANDBY
mode after reset. <NSTBY> control bit is low after reset by default. Reset is entered always if NRST input is
low or internal Power On Reset is active. Power On Reset (POR) will activate during the chip startup or when
the supply voltage VDD falls below 1.5V. Once VDD rises above 1.5V, POR will inactivate and the chip will
continue to the STANDBY mode.
The STANDBY mode is entered if the register bit <NSTBY> is LOW. This is the low power consumption
mode, when all circuit functions are disabled. Registers can be written in this mode and the control bits are
effective immediately after power up.
When <NSTBY> bit is written high or there is a rising edge in the BRC input, the INTERNAL STARTUP
SEQUENCE powers up all the needed internal blocks (Vref, Bias, Oscillator etc..). To ensure the correct
initialization, a 10 ms delay is generated by the internal state-machine after the trim EEPROM values are
read. If the chip temperature rises too high, the Thermal Shutdown (TSD) disables the chip operation and
STARTUP mode is entered until no thermal shutdown event is present.
mode during the 20 ms delay generated by the state-machine. All LED outputs are off during the 20 ms delay
to ensure smooth startup. The Boost startup is entered from Internal Startup Sequence if <EN_BOOST> is
HIGH or from Normal mode when <EN_BOOST> is written HIGH.
During NORMAL mode the user controls the chip using the Control Registers or the BRC input in stand-alone
mode. The registers can be written in any sequence and any number of bits can be altered in a register in
one write.
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