Boost driver for long LED strings

Figure 10 (+27°C rise). The predictor looses accuracy when the peak currents exceed twice the RMS currents, which happens in discontinuous designs. For applications with high ambient temperatures, it may be necessary to use an automotive-rated inductor (+125°C) or use two 6µH inductors in series. For many applications with lower ambient temperatures, the single 12µH inductor would be acceptable.

Temperature measurements

The following temperat功率电感ures were measured using actual LED loads:

VIN:	24VDC
Ambient:	+22°C	ΔT
L1:	+71°C	49°C
D2:	+43°C	21°C
Q2:	+38°C	16°C
Q3:	+34°C	12°C

Power-up procedure

1. Attach a string of up to 23 LEDs between the LED+ post and LED- post.
2. Attach a 24V, 2A pow塑封电感er supply between the V_IN post and GND post.
3. If dimming is desired, attach a PWM signal (0 to 5V) to the DIM IN post and GND po平面电感器st.
4. Turn on the 24V power supply.
5. Adjust the塑封电感 PWM duty cycle, as desired, to obtain dimming.

平面变压器厂家 | 平面电感厂家

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