Datasheet

2
dc1666af
DEMO MANUAL DC1666A
performance summary
(T
A
= 25°C)
PARAMETER CONDITION VALUE (TYPICAL)
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.