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PDF BP1601 Data sheet ( Hoja de datos )

Número de pieza BP1601
Descripción Step-Up Constant Current LED Driver
Fabricantes BPS 
Logotipo BPS Logotipo



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No Preview Available ! BP1601 Hoja de datos, Descripción, Manual

Description
Applications
BP1601 is a step-up DC/DC converter designed to
drive high brightness LED from 4.5V to 24VDC
input voltage . Typically in 12VDC input voltage, up
to seven 1W LED strings is able to be drived.
BP1601 works in current mode to control LED
current, it set the LED current by sense resistor, this
low-side sensing strategy is used to minimize the
power dissipation and improve system efficiency.
BP1601 detects the OV pin voltage to provide open
circuit protection.
The BP1601 includes under-voltage lockout, current
limiting and thermal overload protection preventing
damage in the event of an output overload.
BP1601 is assembled in SOP-8PP package, which
provides excellent heat dissipation and thermal
performance.
Solar LED lighting
Portable LED lighting
LCD LED backlight
Features
4.5V~24V input voltage range
Up to seven 1W LED strings is drived when
VIN=12V
Higher than 90% efficiency
Less than 1uA MOSFET leakage current
200mV current sense voltage
1A current limit
Soft start
Input under-voltage lockout
Output over-voltage protection
Internal over-temperature protection
PWM and analog Dimming
Typical Application
Figure 1 typical application circuit
BP1601_DS_EN V1.0 Jul 2010
www.bpsemi.com
Page 1
Free Datasheet http://www.Datasheet4U.com

1 page




BP1601 pdf
Block Diagram
Figure 2 block diagram
Operation
The BP1601 uses a constant frequency, peak
current mode boost regulator architecture to
regulate the strings of white LEDs. Refer to the
block diagram in Figure 2 for details.
At the start of each oscillator cycle the FET is
turned on through the control circuitry. To
prevent sub-harmonic oscillations at duty cycles
greater than 50%, a stabilizing ramp is added to
the output of the current sense amplifier and the
result is fed into the positive input of the PWM
comparator. When this voltage equals the output
voltage of the error amplifier the power
FET is turned off. The voltage at the output of the
error amplifier is an amplified version of the
difference between the 200mV reference voltage
and the feedback voltage. In this way the peak
current level keeps the output in regulation. If the
feedback voltage starts to drop, the output
of the error amplifier increases. This results in
more current flowing through the power FET,
thus increasing the power delivered to the
output.
BP1601_DS_EN V1.0 Jul 2010
www.bpsemi.com
Page 5
Free Datasheet http://www.Datasheet4U.com

5 Page










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