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A8513 Datasheet(PDF) 11 Page - Allegro MicroSystems

Part # A8513
Description  Wide Input Voltage Range, High Efficiency Fault Tolerant LED Driver
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Manufacturer  ALLEGRO [Allegro MicroSystems]
Direct Link  http://www.allegromicro.com
Logo ALLEGRO - Allegro MicroSystems

A8513 Datasheet(HTML) 11 Page - Allegro MicroSystems

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Wide Input Voltage Range, High Efficiency
Fault Tolerant LED Driver
A8513
11
Allegro MicroSystems, Inc.
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
ISET pin. The limitation of this form of dimming is that the inter-
nal ISET error amplifier is designed to work from 40 to 160 μA,
thus limiting the dimming ratios that can be achieved.
Figure 7, top panel is a typical application using a DAC to control
the LED current using a single resistor connected to the ISET pin.
The ISET current is controlled by the following formula:
ISET =
VISET – VDAC
RISET
(3)
Where VISET is the ISET pin voltage and VDAC is the DAC out-
put voltage.
When the DAC voltage is equal to VISET, the internal reference,
there is no current through RISET. When the DAC voltage starts
to decrease, the ISET current starts to increase, thus increasing
the LED current. When the DAC voltage is 0 V, the LED current
will be at its maximum.
• For a dual-resistor configuration (lower panel of figure 7), the
ISET current is controlled by the following formula:
ISET =
VISET
RISET
VDAC – VISET
R1
(4)
The advantage of this circuit is that the DAC voltage can be
higher or lower, thus adjusting the LED current to a higher or
lower value of the preset LED current set by the RISET resistor:
▫ VDAC = 1.003 V; the output is strictly controlled by RISET
▫ VDAC > 1.003 V; the LED current is reduced
▫ VDAC < 1.003 V; the LED current is increased
Output Overvoltage Protection (OVP) and Output
Undervoltage Protection (UVP)
The A8513 has output overvoltage protection (OVP), output
undervoltage protection and secondary overvoltage protection
(open diode).
Overvoltage Protection
The OVP pin has a threshold, VOVPHI(th),
of 1.218 V. A resistive divider can be used to set the VOUT over-
voltage protection threshold up to 45 V (see figure 8). There is
no restriction on the value of the resistor chosen, but it is recom-
mended that the divider current be kept between 10 and 60 μA.
This will minimize the effect of sense current on the accuracy of
OVP, and minimize output voltage bleed-off during PWM dim-
ming.
Formulas for calculating the OVP resistor voltage divider are
shown below.
ROVP1 = (VOVP – 1.218 V) / ISET
(5)
ROVP2 = 1.218 V / ISET
(6)
The OVP function is not inherently a latched fault. If the OVP
condition occurs during a load dump, the IC will stop switching
but not shut down.
Figure 7. Simplified diagram of voltage LED current control (upper) single
resistor, and (lower) dual resistors.
Figure 8. Simplified diagram of the OVP pin functions.
GND
DAC
VDAC
GND
A8513
ISET
GND
DAC
VDAC
GND
A8513
ISET
RISET
R1
RISET
OVP
VOUT
ROVP1
ROVP2
A8513
1.218 V
100 mV


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