Linear Technology LT3791, 4.7V-60V input to drive 25V of LEDs at 2A (scalable to 100W) DC1666A DC1666A 데이터 시트

2

dc1666af

DEMO MANUAL DC1666A

Input Voltage PV

IN

 Range*

Operating

4.7V to 60V*

Switching Frequency

R12 = 86.6k

300kHz

I

LED

CTRL = Float, 7V < PV

IN

 < 57.6V 

2.0A

V

LED

 Range

R7 = 1M, R9 = 44.2k

9.5V < V

LED

 < 25.5V

Open LED Voltage

R7 = 1M, R9 = 44.2k

28.3V

Typical Efficiency Boost Region

PVIN = 20V, V

LED

 = 25V, I

LED

 = 2A

97.5%

Typical Efficiency Buck-Boost Region

PVIN = 24V, V

LED

 = 25V, I

LED

 = 2A

96.8%

Typical Efficiency Buck Region

PVIN = 30V, V

LED

=25V, I

LED

 = 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.