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Original question:

LED Driver Recommendation Inquiry

LED Driver recommendation, 0.5 to 1.5A, wide Vin 12-24V, to beat DIODES AL8860

Robert Walker1
Prodigy 80 points
Other Parts Discussed in Thread: TPS92200, TPS92390, LM36010, TPS92360

Hi

what is TI equivalent to the following similar BUCK LED driver ?

need to drive 0.5A (for MR16, G4, etc), or 1.5A for a larger lamp (PAR36, 56 etc)

 

Diodes AL8860WT-7, AL8860MP-13, (1.5A, max PWM ??)

Legend LGS6304X (1.5A, PWM to 100KHz)

Powtech PT4115B89E (1.2A)

  

4 color RGBW

We plan to use PWM dimming 20KHz

Voltage rail is 12V to 24V AC/DC, and we aim to use 3 x 3V LED in series as a string, and multiple parallel strings

Our LED is max 150mA (per string), but actual current is per the table

We would use 4 of these BUCK LED driver per lamp (R,G,B,W)

 

 

 

 

 

Current Need Per LED (A) @ MAX W

Current Need Per Ch (A) @ MAX W

 

LM

LED Qty

Max W

R

G

B

W

R

G

B

W

MR16

470

9

6

0.150

0.150

0.150

0.131

0.450

0.450

0.450

0.392

G4

450

24

6

0.063

0.063

0.063

0.047

0.500

0.500

0.500

0.375

PAR36

900

51

12

0.059

0.059

0.059

0.044

1.000

1.000

1.000

0.750

PAR56

1200

99

18

0.045

0.045

0.045

0.030

1.500

1.500

1.500

1.000

 

 

  • 0
    TI__Expert 6440 points

    Hi Robert,

    Nice to hear you!
    For your applications, I think TPS92200 is the suitable device for the 1.5A current LED driver.

    For the 4 channels 150mA LED driver, I'd like to recommend you TPS92390.

    Please let me know if you have any concern for your system.

    Thanks!

    Ives Li

  • 0 in reply to Ives Li
    Prodigy 80 points

    Thanks for the suggestions.

    TPS92200 , Since we’re using PWM from a micro, I think the D1 should suffice ? or does D2 dim better even with PWM ?

    And no Schottky Diode required ?

    PWM says Frequency: 100 Hz–2 kHz, we need to use 20KHz, will it work ? efficiency ?

    (Note, same for DIODES, “higher dimming frequencies can be used, at the expense of dimming dynamic range and accuracy”)

    Price TPS92200  $0.36@1K is WAY too expensive, its 3x the price of others.

    TI TPS92200D1RXLR (30V, 1.5A, 1MHz, VQFN 1.5x2.0mm, 90mR, no Schottky, PWM 2KHz, $0.36)

    Diodes AL8860MP-13, (40V, 1.5A, 1MHz, MSOP 3x4.9mm, Schottky Req, PWM 500Hz, $0.13)

    Legend LGS63042 (60V, 1.5A, 350mR, Schottky Req, PWM 100KHz, ESOP8 3x3mm, $0.10)

    TPS92390 4 x 200mA will not work, as we need 0.5A or 1.5A

  • 0 in reply to Robert Walker1
    TI__Expert 6440 points

    Hi Robert,

    If your MCU can only generate 20kHz PWM signal, TPS92200D2 is the better choice for you. It can support analog dimming which will generate constant current for your LED, and the constant current is set by the internal reference voltage which can be regulated by 20kHz - 200kHz PWM signal.

    And for TPS92200, the Schottky Diode is not required because it is a Synchronous Buck LED Driver and integrate both high-side and low-side NMOS switch.

    For the price, if you can use low Vin(2.7 - 5.5V). TPS92360 or LM36010/1 is cheaper than TPS92200. But still expensive than the devices you listed.

    Thanks!