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40VIN, 75VOUT LED Controllers
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LT3755/LT3755-1/LT3755-2
40VIN, 75VOUT LED Controllers
FEATURES DESCRIPTION 3000:1 True Color PWM™ Dimming
Wide Input Voltage Range: 4.5V to 40V
Output Voltage Up to 75V
Constant-Current and Constant-Voltage Regulation
100mV High Side Current Sense
Drives LEDs in Boost, Buck Mode, Buck-Boost Mode,
SEPIC or Flyback Topology
n Adjustable Frequency: 100kHz to 1MHz
n Open LED Protectio Programmable Undervoltage Lockout with Hysteresis
n Improved Open LED Status Pin (LT3755-2)
n Frequency Synchronization (LT3755-1)
n PWM Disconnect Switch Driver
n CTRL Pin Provides Analog Dimming
n Low Shutdown Current: 1.2V or ILED = (VCTRL –100mV)/
(10 • RLED) when VCTRL ≤ 1V. Input bias current is typically 25µA. Below 3V, ISN is an input to the short-circuit
protection feature that forces GATE to 0V if ISP exceeds
ISN by more than 150mV (typ).
ISP (Pin 4/Pin 14): Connection Point for the Positive
Terminal of the Current Feedback Resistor. Input bias
current is dependent upon CTRL pin voltage as shown
in the TPC. ISP is an input to the short‑circuit protection …
