LM3633 datasheet(42/58 Pages) TI2

42 / 58 page

0.01

0.10

1.00

10.00

100.00

11-bit Brightness Code

25C

C001

-15.0%

-10.0%

-5.0%

0.0%

5.0%

10.0%

15.0%

20.0%

11-bit Brightness Code

m12

m23

m31

C001

0.00%

0.20%

0.40%

0.60%

0.80%

1.00%

2.5

3.5

4.5

5.5

VIN (V)

-35C

25C

90C

C001

0.00%

0.10%

0.20%

0.30%

0.40%

0.50%

0.60%

2.5

3.5

4.5

5.5

VIN (V)

90C

25C

-35C

C001

70%

72%

74%

76%

78%

80%

82%

84%

86%

ILED (mA)

Two String, L=4.7µH, 500kHz

C002

70%

72%

74%

76%

78%

80%

82%

84%

86%

ILED (mA)

Two String, L=4.7µH, 1MHz

C002

LM3633

SNVS867 – JUNE 2014

www.ti.com

VIN = 3.6 V, VLED = 3.2 V @ 20 mA, Typical Application Circuit, TA = 25°C, Full-Scale Current = 20.2 mA unless otherwise

specified. Efficiency is VOUT × (IHVLED1 + IHVLED2 + IHVLED3)/(VIN × IIN), matching curves are (ΔILED_MAX/ILED_AVE). See Table 37.

Top to Bottom: 2x3, 2x4, 2x5, 2x6, 2x7, 2x8, 2x9, 2x10 (LEDs)

Figure 54. Efficiency vs ILED

Figure 55. Efficiency vs ILED

ILED = 20 mA

Figure 56. HVLED Matching vs VIN, Temp

Figure 57. LVLED Matching vs VIN, Temp

Exponential Mapping

Figure 58. HVLED Current vs Code

Figure 59. HVLED Matching vs Code

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