DC1666A Datasheet, PDF (2/8 Pages) Linear Technology – Four-Switch Buck-Boost LED Driver Controller

DEMO MANUAL DC1666A
Performance Summary (T_A = 25°C)
PARAMETER
CONDITION
VALUE (TYPICAL)
Input Voltage PV_IN Range*
Switching Frequency
Operating
R12 = 86.6k
4.7V to 60V*
300kHz
I_LED
V_LED Range
Open LED Voltage
CTRL = Float, 7V < PV_IN < 57.6V
R7 = 1M, R9 = 44.2k
R7 = 1M, R9 = 44.2k
2.0A
9.5V < V_LED < 25.5V
28.3V
Typical Efficiency Boost Region
Typical Efficiency Buck-Boost Region
Typical Efficiency Buck Region
Undervoltage Lockout (Falling Turn-Off)
PVIN = 20V, V_LED = 25V, I_LED = 2A
PVIN = 24V, V_LED = 25V, I_LED = 2A
PVIN = 30V, V_LED=25V, I_LED = 2A
R13 = 332k and R6 = 115k
97.5%
96.8%
97.3%
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.
dc1666af
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