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ISSI IS32LT3958 | Demoboard IS32LT3958 BOOST EVALUATION BOARD
HIGH VOLTAGE LED LIGHTING CONTROLLER WITH INTERNAL PWM GENERATOR AND FAULT PROTECTION
Overview
| Topology | Boost Converter |
| Input voltage | 9-16 V |
| IC revision | B |
Description
The IS32LT3958 is a current mode PWM controller designed to drive a low side external NMOS FET for wide input/output voltage range and high LED current applications. An external resistor senses the high side output current of the LED string. A high side sense is the most flexible current sensing scheme, since it functions in either boost or buck-boost mode configurations. The controller can be configured with an external resistor to operate between 100kHz~1MHz frequency resulting in small external inductor and capacitors while maintaining high efficiency. A single capacitor is all that is required to set the spread spectrum dither frequency to reduce the radiated peak emission and optimize the system EMI performance.
Features
- Wide high voltage input range: 5V to 70V
- Supports boost, buck-boost, SEPIC and buck topology
- Supports either analog, internal PWM dimming or external PWM dimming
- Stand-alone dual brightness output by internal PWM dimming
- Integrated PWM generator
- 100Hz~1kHz adjustable PWM frequency
- 5%~100% adjustable PWM duty cycle
- Excellent analog dimming capability
- Two analog dimming pins
- LED binning capability
- LED over temperature current rolloff
- Externally programmable input under voltage lockout
- ±2.8% output current accuracy over -40°C ~ +150°C temperature
- Adjustable operating frequency range of 100kHz~1MHz
- Programmable soft start to avoid inrush current
- EMI reduction capabilities
- Programmable spread spectrum function
- Operating frequency synchronization with external clock source
- Fault protection with reporting:
- VCC under voltage lockout (not reported)
- Programmable output overvoltage protection
- Output short circuit protection
- RT/SYNC pin short protection
- VDD pin short protection
- VDD under voltage lockout (not reported)
- Over temperature protection
- RoHS & Halogen-Free Compliance
- TSCA Compliance
- AEC-Q100 Qualified with Temperature Grade 1: -40°C to 125°C
Typical applications
- LED load (7~10 LEDs in series/1A)
- 9V~16V, 6A DC power supply
More information
Products
Order Code | Datasheet | Simulation | Downloads | Status | Product series | Winding Style | Number of windings | L1(µH) | Z(Ω) | IR(mA) | RDC max.(Ω) | VR(V) | Samples | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
 | WE-SL5 HC SMT Common Mode Line Filter, sectional, 2 | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-SL5 HC SMT Common Mode Line Filter | Winding Stylesectional | Number of windings2 | Inductance [1]5 µH | Impedance500 Ω | Rated Current5000 mA | DC Resistance [1]0.0055 Ω | Rated Voltage80 V |