LM3633 datasheet(39/58 Pages) TI2

39 / 58 page

68%

70%

72%

74%

76%

78%

80%

82%

84%

86%

88%

2.5

3.5

4.5

5.5

VIN (V)

Two String, L=4.7µH, 500kHz

C002

60%

65%

70%

75%

80%

85%

90%

2.5

3.5

4.5

5.5

VIN (V)

Two String, L=4.7µH, 1MHz

C002

70%

72%

74%

76%

78%

80%

82%

84%

86%

88%

90%

2.5

3.5

4.5

5.5

VIN (V)

Three String, L=4.7µH, 500kHz

C002

65%

70%

75%

80%

85%

90%

2.5

3.5

4.5

5.5

VIN (V)

Three String, L=4.7µH, 1MHz

C002

70%

72%

74%

76%

78%

80%

82%

84%

86%

88%

90%

92%

2.5

3.5

4.5

5.5

VIN (V)

One String, L=10µH, 500kHz

C002

70%

72%

74%

76%

78%

80%

82%

84%

86%

88%

90%

92%

2.5

3.5

4.5

5.5

VIN (V)

One String, L=10µH, 1MHz

C002

LM3633

www.ti.com

SNVS867 – JUNE 2014

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: 1x3, 1x4, 1x5, 1x6, 1x7, 1x8, 1x9, 1x10 (LEDs)

Figure 36. Efficiency vs VIN, Single String

Figure 37. Efficiency vs VIN, Single String

Top to Bottom: 3x3, 3x4, 3x5, 3x6 (LEDs)

Figure 38. Efficiency vs VIN, Three String

Figure 39. Efficiency vs VIN, Three String

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

Figure 40. Efficiency vs VIN, Dual String

Figure 41. Efficiency vs VIN, Dual String

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