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EL7513IYZ Datasheet(PDF) 9 Page - Intersil Corporation

Part # EL7513IYZ
Description  White LED Step-Up Regulator
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Manufacturer  INTERSIL [Intersil Corporation]
Direct Link  http://www.intersil.com/cda/home
Logo INTERSIL - Intersil Corporation

EL7513IYZ Datasheet(HTML) 9 Page - Intersil Corporation

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Detailed Description
The EL7513 is a constant current boost regulator specially
designed for driving white LEDs. It can drive up to 4 LEDs in
series or 12 LEDs in parallel/series configuration and
achieves efficiency up to 91%.
The brightness of the LEDs is adjusted through a voltage
level on the CNTL pin. When the level falls below 0.1V, the
chip goes into shut-down mode and consumes less than
1µA of current for VIN less than 5.5V.
Steady-State Operation
EL7513 is operated in constant frequency PWM. The
switching is around 1MHz. Depending on the input voltage,
the inductance, the type of LEDs driven, and the LED’s
current, the converter operates at either continuous
conduction mode or discontinuous conduction mode (see
waveforms). Both are normal.
Brightness Control
LED’s current is controlled by the voltage level on CNTL pin
(VCNTL). This voltage can be either a DC or a PWM signal
with frequency less than 200Hz (for C3=4700pF). When a
higher frequency PWM is used, an RC filter is recommended
before the CNTL pin (see Figure 20).
The relationship between the LED current and CNTL voltage
level is as follows:
When R1 is 5Ω, 1V of VCNTL conveniently sets ILED to
15mA. The range of VCNTL is 250mV to 5.5V.
Shut-Down
When VCNTL is less than 100mV, the converter is in shut-
down mode. The max current consumed by the chip is less
than 1µA for VIN less than 5.5V.
Over-Voltage Protection
When an LED string is disconnected from the output, VO will
continue to rise because of no current feedback. When VO
reaches 18V (nominal), the chip will shut down. The output
voltage will drop. When VO drops below 16V (nominal), the
chip will boost output voltage again until it reaches 18V. This
hiccough continues until LED is applied or converter is shut
down.
When designing the converter, caution should be taken to
ensure the highest operating LED voltage does not exceed
17V, the minimum shut-down voltage. There is no external
component required for this function.
Component Selection
The input and output capacitors are not very important for
the converter to operate normally. The input capacitance
is normally 0.22µF - 4.7µF and output capacitance
0.22µF - 1µF. Higher capacitance is allowed to reduce the
voltage/current ripple, but at added cost. Use X5R or X7R
type (for its good temperature characteristics) of ceramic
capacitors with correct voltage rating and maximum height.
FIGURE 18. DISCONTINUOUS CONDUCTION MODE
FIGURE 19. OVER VOLTAGE PROTECTION (LED
DISCONNECTED)
Waveforms (Continued)
All performance curves and waveforms are taken with C1 = 4.7µF, C2 = 1µF, C3 = 0.1µF, L = 33µF, VIN = 3.3V, VCNTL = 1V, R1 =5Ω, 4 LEDs in a
series; unless otherwise specified.
VCTRL=0.34V, ILED=5mA
∆VIN
IL
VLX
∆VO
10mV/DIV
100mA/DIV
10V/DIV
50mV/DIV
1µs/DIV
VO (5V/DIV)
VCOMP (1V/DIV)
FIGURE 20. PWM BRIGHTNESS CONTROL
CNTL
COMP
PWM
SIGNAL
0.1µF
100K
I
LED
V
CNTL
13.33
R
1
×
----------------------------
=
EL7513


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