DATASHEET ISL8843 FN9238 Rev 2.00 Industry Standard Single-Ended Current Mode PWM Controller September 14, 2015 The ISL8843 is an industry standard drop-in replacement for Features the popular 28C43 and 18C43 PWM controllers suitable for 1A MOSFET gate driver a wide range of power conversion applications including boost, flyback, and isolated output configurations. Its fast 90 A start-up current, 125A maximum signal propagation and output switching characteristics 35ns propagation delay current sense to output make this an ideal product for existing and new designs. Fast transient response with peak current mode control Features include 30V operation, low operating current, 90A 30V operation start-up current, adjustable operating frequency to 2MHz, and high peak current drive capability with 20ns rise and fall Adjustable switching frequency to 2MHz times. 20ns rise and fall times with 1nF output load PART NUMBER RISING UVLO MAX. DUTY CYCLE Trimmed timing capacitor discharge current for accurate ISL8843 8.4V 100% deadtime/maximum duty cycle control 1.5MHz bandwidth error amplifier Tight tolerance voltage reference over line, load, and Ordering Information temperature PKG. 3% current limit threshold PART TEMP. DWG. PART NUMBER MARKING RANGE (C) PACKAGE Pb-free plus anneal available and ELV, WEEE, RoHS ISL8843ABZ 8843 ABZ -40 to 105 8 Ld SOIC M8.15 Compliant (See Note) (Pb-free) ISL8843AUZ 8843Z -40 to 105 8 Ld M8.118 Applications (See Note) (No MSOP Telecom and datacom power longer available, (Pb-free) recommended Wireless base station power replacement: ISL8843AAUZ) File server power ISL8843MBZ 8843 MBZ -55 to 125 8 Ld SOIC M8.15 Industrial power systems (See Note) (Pb-free) PC power supplies ISL8843MUZ 843MZ -55 to 125 8 Ld M8.118 (See Note) (No MSOP Isolated buck and flyback regulators longer available, (Pb-free) Boost regulators recommended replacement: ISL8843AMUZ) Pinout ISL8843 Add -T to part number for Tape and Reel packaging. (8 LD SOIC, MSOP) TOP VIEW NOTE: Intersil Pb-free plus anneal products employ special Pb-free material sets molding compounds/die attach materials and 100% matte tin plate termination finish, which are RoHS compliant and COMP 1 8 VREF compatible with both SnPb and Pb-free soldering operations. Intersil FB 2 7 VDD Pb-free products are MSL classified at Pb-free peak reflow temperatures that meet or exceed the Pb-free requirements of CS 3 6 OUT IPC/JEDEC J STD-020. RTCT 4 5 GND FN9238 Rev 2.00 Page 1 of 13 September 14, 2015ISL8843 + - FN9238 Rev 2.00 Page 2 of 13 September 14, 2015 Functional Block Diagram V V REF VREF DD 5.00 V START/STOP UV COMPARATOR ENABLE V OK + DD - - VREF FAULT + + - VREF GND UV COMPARATOR 4.65V 4.80V A 2.5V A=0.5 PWM COMPARATOR CS + - 100mV 5% 2R 1.1V 3% + CLAMP - FB VF Total = 1.15V ERROR R AMPLIFIER COMP OUT S Q 36K R Q RESET 100 nS DOMINANT VREF FALLING EDGE DELAY 100K 2.9V 1.0V ON 150K OSCILLATOR COMPARATOR < 10nS - RTCT + CLOCK 8.4mA ON + -