LT3791 datasheet(2/8 Pages) LINER

tên linh kiện	LT3791

Giải thích chi tiết về linh kiện	Four-Switch Buck-Boost LED Driver Controller

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dc1666af

DEMO MANUAL DC1666A

performance summary (T

A = 25°C)

PARAMETER

CONDITION

VALUE (TYPICAL)

Input Voltage PVIN Range*

Operating

4.7V to 60V*

Switching Frequency

R12 = 86.6k

300kHz

ILED

CTRL = Float, 7V < PVIN < 57.6V

2.0A

VLED Range

R7 = 1M, R9 = 44.2k

9.5V < VLED < 25.5V

Open LED Voltage

R7 = 1M, R9 = 44.2k

28.3V

Typical Efficiency Boost Region

PVIN = 20V, VLED = 25V, ILED = 2A

97.5%

Typical Efficiency Buck-Boost Region

PVIN = 24V, VLED = 25V, ILED = 2A

96.8%

Typical Efficiency Buck Region

PVIN = 30V, VLED=25V, ILED = 2A

97.3%

Undervoltage Lockout (Falling Turn-Off)

R13 = 332k and R6 = 115k

4.7V

Undervoltage Lockout (Rising Turn-On)

R13 = 332k and R6 = 115k

5.7V

Overvoltage Lockout (Rising Turn-Off)

R11 = 54.9k, R19 = 1M

57.6V

Overvoltage Lockout (Falling Turn-On)

R11 = 54.9k, R19 = 1M

56.2V

Peak Switch Current Limit Boost Region

RS = 0.004Ω

11A

Valley Switch Current Limit Buck Region

RS = 0.004Ω

10A

* The guaranteed input voltage range of the LT3791 is 4.7V to 60V. Overvoltage lockout is set externally at 57.6V on this demo circuit to protect the 60V

MOSFETs M1 and M2. Overvoltage lockout is adjustable.

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