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LM3432 Arkusz danych(PDF) 10 Page - Texas Instruments

Numer części LM3432
Szczegółowy opis  6-Channel Current Regulator for LED Backlight Application
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CMODE =
1.65 x 10
-5
fPWM
where CMODE is in Farads
fPWM =
1.65 x 10
-5
CMODE
where fPWM is in Hz
+
-
+
-
-
3V
-
Comp2
1V
1V
3V
Ramp
Generator
VDIM
1V to 3V
MODE
DIM
CMODE
VCC
PWM
Modulator
34 PA
PWM
Comp1
+
-
LM3432, LM3432B
SNVS498D – APRIL 2007 – REVISED MAY 2013
www.ti.com
Figure 14. Analog Dimming of LEDs
An internal current source of 34 µA (typical) will charge the external capacitor (CMODE) linearly until it reaches 3V.
The comparator (Comp1) then forces CMODE to be discharged to 1V very quickly. By repeating the cycle, a saw-
tooth waveform as shown in Figure 14 is generated. Comparator (Comp2) compares this ramp waveform with
the external dc voltage at the DIM pin generating the desired PWM control signal.
When VDIM ≤ 1V, ON duty factor, DON = 0% and when VDIM ≥ 3V, DON = 100%. The frequency of the PWM
control signal can be calculated as shown below.
(2)
Or
(3)
PWM DIGITAL DIMMING of LED STRINGS
Alternatively, the dimming control can be implemented by direct application of a digital signal to the device. With
the MODE pin connected to ground, an externally applied PWM dimming signal is applied to the DIM pin. The
peak amplitude of the externally applied PWM signal should be greater than 1.5V to ensure clean PWM
switching.
During PWM dimming, channels are not switched simultaneously in an effort to minimize large surge currents
from being drawn from the LED supply rail. Each channel will have 0.5 µs phase delay with respect to the
preceding channel. As a consequence of the phase delay, for a control pulse width less than 0.5 µs, the duty
cycle will be rounded down to 0% and for a control pulse width less than 0.5 µs off time, the duty cycle will be
rounded up to 100%. Therefore, 0.5µs becomes the finest pulse width resolution that can be realized. The PWM
switching timing for all six channels is shown in Figure 15.
10
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Product Folder Links: LM3432 LM3432B


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