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PDF PA5711 Data sheet ( Hoja de datos )
| Número de pieza | PA5711 | |
| Descripción | High Voltage LED Driver | |
| Fabricantes | Protekdevices | |
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ANALOG PRODUCTS DIVISION
FEATURES
11V to 480V Input Voltage Range.
Over 95% Efficiency.
Drives from 1 to hundreds of LED’s in Serial and Parallel
combinations.
Constant LED Drive current.
Linear or PWM luminance dimming control.
Light sense and Motion detection inputs to control the
LED’s.
Resistor Programmable Oscillator Frequency.
QFN-16 RoHs Compliant Package.
APPLICATIONS
General Illumination Displays
Industrial and Decorative LED Lighting.
Automotive applications.
DC/DC or AC/DC LED driver applications.
Constant current source.
SMPS switching controller.
LED back lighting.
Security, Street and Parking garage lighting.
PA5711
High Voltage LED Driver
GENERAL DESCRIPTION
The PA5711 is a High-Efficiency LED driver with multiple
dimming options that include Pulse Width Modulation (PWM),
Linear dimming (LD), Motion Detection (MD) and Light sense
(LS) inputs. PA5711 features a direct gate driver control
through an active high enable pin. It has an internal oscillator
whose frequency can be set externally through a resistor.
The PA5711 in fly-back mode can be used as a current
controlled LED driver (Isolated), driving an LED load at fixed
current from a few mA to over 1.4A.
The PA5711 allows the users to introduce the leading edge
blanking upon their desired delay requirements, also this can
be used to control the Duty cycle of the driver.
The LD pin allows the users to set the threshold beneath the
pre-set 280mV, for smaller duty cycle and reduced dissipation
across the CS resistors.
The PA5711 has a PWM dimming option that through an
externally programmed control signal, with duty ratio 0-100%
and a frequency of a few Kilo-hertz, can control the LED
brightness.
PA5711 BLOCK DIAGRAM
REXT
VDD
280mV
CS
Voltage
Regulator
-
+
+
-
VIN
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Oscillator
PWM Controller
Gate
Driver
ROSC
Gate
LD
PWM
ORDERING INFORMATION
Temperature Range Package
-40 to 85 °C
QFN-16
MD
Part Number
PA5711-T7
GND
LS EN
Figure 1. Block diagram
2929 South Fair Lane, Tempe Tel: (602) 431-8101. Fax: (602) 431-2288
Rev.0. 03/12
www.protekdevices.com
NOT FOR USE IN LIFE SUPPORT SYSTEMS
1
Datasheet pdf - http://www.DataSheet4U.net/
1 page  
ANALOG PRODUCTS DIVISION
PA5711
High Voltage LED Driver
2.2 LED DRIVER - THEORY OF OPERATION
The gates of PWM, EN, MD, and LD are enabled when they
are connected to the VDD pin. The LS must be connected
to GND. In such a configuration the LED current is solely
controlled by the CS resistor. Each positive edge of the
oscillator turns the Gate driver output high, turning on the
external MOSFET. This ramps the Inductor current and
increases the voltage drop across the CS resistor. When
this drop exceeds VCS, the gate driver output is low. This
turns off the MOSFET decaying the inductor current until the
next positive edge of the clock cycle.
The current threshold limit is set by comparing the voltage
developed across RCS to VCS, which is 280mV for the
PA5711.This default threshold level can be reduced
applying a voltage lower than VCS at the LD pin. The lower
of these two thresholds limits the peak current in the
inductor.
2.2.2 Current Sense Resistor
The peak LED current is set by the external sense resistor
connected from the CS pin to ground. The value of this
resistor is determined by the average LED current, the
inductor ripple current and the internal threshold voltage.
The inductor is selected to keep the inductor ripple current
less than 30% of the average LED current.The dissipation
across this resistor is given by the formula :
P = RCS* ILED 2
It is a safe practice to select the resistor with atleast twice
the power rating that is calculated.
Gate Driver Output
2.2.1 Voltage Regulator
The PA5711 has an internal voltage regulator that can
regulate 11V to 480V input voltage, with an appropriate
current limiting resistor at REXT, down to 5V. The VDD pin
needs to have a holding cap of 22µF to provide filtering
against bounces and a 0.1µF to by pass any high frequency
switching noise. The PA5711 VDD pin can supply 1mA for
external circuitry.
Voltage across RCS
The internal voltage regulator can be bypassed by providing
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a voltage higher than internal VDD. This feature reduces the
Figure 3. PA5711 Waveforms
power dissipation and can be implemented in an application
where an auxiliary supply can power to the PA5711.
2.2.3 Current Sense Blanking
The total input current from the VIN supply is a sum of the
quiescent current of the PA5711, which is about 1.87mA
and the gate driver current. The gate driver current is
dependent on the gate charge of the external MOSFET and
switching frequency.
This input current approximation can be done by using the
following equation:
IIN ≈ 1.87mA + (QGATE * fs)
The PA5711 has no internal current sense blanking circuit.
This allows the user to choose and introduce the right time
delay that fits the application. The user can add a RC delay
network on the CS path i.e. between the RCS and the CS
pin. A time delay approximation can be made using :
= 5*R*C
Where R and C are the delay elements
Where QGATE is the total gate charge of the External
MOSFET.
2.2.4 Enable / Disable
REXT in k
10
VIN Range in volts
11 - 50
20 30 - 100
100 75 - 200
330 175 - 300
560 290 - 400
750 400 - 480
An indicative table to choose the approximate value of REXT
depending on VIN
The Enable pin (EN) of the PA5711 is active high. If this pin
is grounded then the Driver is disabled and chip will
consume minimal current. The Gate driver is disabled and
the LED’s cannot be driven during this period. For normal
operation the Enable pin must be connected high.
2929 South Fair Lane, Tempe Tel: (602) 431-8101. Fax: (602) 431-2288
Rev.0. 03/12
www.protekdevices.com
NOT FOR USE IN LIFE SUPPORT SYSTEMS
5
Datasheet pdf - http://www.DataSheet4U.net/
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