Datasheet ISL6840, ISL6841, ISL6842, ISL6843, ISL6844 Improved Industry Standard Single-Ended Current Mode PWM Controller The ISL6840, ISL6841, ISL6842, ISL6843, and Features ISL6844 (ISL684x) family of adjustable frequency, low 1A MOSFET gate driver power, Pulse-Width Modulating (PWM) current mode 60A start-up current, 100A maximum controllers is designed for a wide range of power conversion applications including boost, flyback, and 25ns propagation delay current sense to output isolated output configurations. Peak current mode Fast transient response with peak current mode control effectively handles power transients and control provides inherent overcurrent protection. Adjustable switching frequency to 2MHz This advanced BiCMOS design is pin-compatible with the industry standard 384x family of controllers and 20ns rise and fall times with 1nF output load offers significantly improved performance. Features Trimmed timing capacitor discharge current for include low operating current, 60A start-up current, accurate deadtime/maximum duty cycle control adjustable operating frequency to 2MHz, and high High bandwidth error amplifier peak current drive capability with 20ns rise and fall times. Tight tolerance voltage reference over line, load, and temperature Part Number Rising UVLO (V) MAX. Duty Cycle (%) Tight tolerance current limit threshold ISL6840 7.0 100 Pb-free available (RoHS compliant) ISL6841 7.0 50 ISL6842 14.4 100 Applications ISL6843 8.4 100 Telecom and datacom power ISL6844 14.4 50 Wireless base station power Related Literature File server power For a full list of related documents, visit our website: Industrial power systems PC power supplies ISL6840, ISL6841, ISL6842, ISL6843, ISL6844 device pages Isolated buck and flyback regulators Boost regulators FN9124 Rev.14.00 Page 1 of 17 Jul.22.19ISL6840, ISL6841, ISL6842, ISL6843, ISL6844 1. Overview FN9124 Rev.14.00 Page 2 of 17 Jul.22.19 1. Overview 1.1 Typical Applications CR 5 +3.3V C + C + C 21 15 16 T 1 R 21 VIN+ +1.8V C 4 R CR 3 4 + C + 22 C C C 17 20 2 CR C 19 2 C 5 RETURN CR 6 R 1 36V to 75V R R 17 R 18 16 C 6 C C R 1 3 19 U 2 Q C 1 14 R 4 R R 22 15 C 13 VIN- U 3 R 27 R 20 U 4 R 26 COMP VREF CS V DD FB OUT RTCT GND ISL684x R 6 R10 CR 1 Q 3 C 12 C VR 8 1 C 11 R 13 Figure 1. 48V Input Dual Output Flyback