Industry Standard Single-Ended Current Mode PWM Controller

® ISL8843 Data Sheet January 3, 2006 FN9238.1 Industry Standard Single-Ended Current Mode PWM Controller The ISL8843 is an industry standard drop-in replacement for the popular 28C43 and 18C43 PWM controllers suitable for a wide range of power conversion applications including boost, flyback, and isolated output configurations. Its fast signal propagation and output switching characteristics make this an ideal product for existing and new designs. Features include 30V operation, low operating current, 90µA start-up current, adjustable operating frequency to 2MHz, and high peak current drive capability with 20ns rise and fall times. PART NUMBER ISL8843 RISING UVLO 8.4V MAX. DUTY CYCLE 100% Features • 1A MOSFET gate driver • 90µA start-up current, 125µA maximum • 35ns propagation delay current sense to output • Fast transient response with peak current mode control • 30V operation • Adjustable switching frequency to 2MHz • 20ns rise and fall times with 1nF output load • Trimmed timing capacitor discharge current for accurate deadtime/maximum duty cycle control • 1.5MHz bandwidth error amplifier • Tight tolerance voltage reference over line, load, and temperature • ±3% current limit threshold • Pb-free plus anneal available and ELV, WEEE, RoHS Compliant Ordering Information PART NUMBER ISL8843ABZ (See Note) ISL8843AUZ (See Note) PART MARKING 8843 ABZ 8843Z TEMP. PKG. RANGE (°C) PACKAGE DWG. # -40 to 105 -40 to 105 -55 to 125 -55 to 125 8 Ld SOIC (Pb-free) M8.15 Applications • Telecom and datacom power • Wireless base station power • File server power • Industrial power systems • PC power supplies • Isolated buck and flyback regulators • Boost regulators 8 Ld MSOP M8.118 (Pb-free) 8 Ld SOIC (Pb-free) M8.15 ISL8843MBZ 8843 MBZ (See Note) ISL8843MUZ 843MZ (See Note) 8 Ld MSOP M8.118 (Pb-free) Add -T to part number for Tape and Reel packaging. 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 compatible with both SnPb and Pb-free soldering operations. Intersil Pb-free products are MSL classified at Pb-free peak reflow temperatures that meet or exceed the Pb-free requirements of IPC/JEDEC J STD-020. Pinout ISL8843 (8 LD SOIC, MSOP) TOP VIEW COMP 1 FB 2 CS 3 RTCT 4 8 VREF 7 VDD 6 OUT 5 GND 1 CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures. 1-888-INTERSIL or 1-888-468-3774 | Intersil (and design) is a registered trademark of Intersil Americas Inc. Copyright © Intersil Americas Inc. 2005, 2006 All Rights Reserved. All other trademarks mentioned are the property of their respective owners. Functional Block Diagram VDD START/STOP UV COMPARATOR + + GND 2.5V A A=0.5 VDD OK ENABLE VREF 5.00 V VREF VREF FAULT + VREF UV COMPARATOR 4.65V ↓ 4.80V ↑ PWM COMPARATOR CS + + - 100mV 5% + - 2 FN9238.1 January 3, 2006 ISL8843 FB + ERROR AMPLIFIER VF Total = 1.15V 2R 1.1V 3% CLAMP R COMP OUT S R Q 36K Q VREF 100K 2.9V 1.0V ON 150K OSCILLATOR COMPARATOR < 10nS RTCT 8.4mA ON + CLOCK 100 nS FALLING EDGE DELAY RESET DOMINANT Typical Application - 48V Input Dual Output Flyback CR5 +3.3V T1 VIN+ R3 C4 CR4 C17 + C22 + C20 RETURN CR6 R1 36-75V C6 C1 C3 Q1 U2 R16 R17 R19 C14 R18 C21 R21 +1.8V + C15 + C16 C2 C5 CR2 C19 3 VINR6 Q3 VR1 FN9238.1 January 3, 2006 R4 R22 U3 R27 C13 R15 ISL8843 R20 U4 R26 COMP VREF CS FB V DD OUT RTCT GND ISL8843 CR1 R10 C12 C8 R13 C11 ISL8843 Absolute Maximum Ratings Supply Voltage, VDD . . . . . . . . . . . . . . . . . . . GND - 0.3V to +30.0V OUT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . GND - 0.3V to VDD + 0.3V Signal Pins . . . . . . . . . . . . . . . . . . . . . . . . . . . . GND - 0.3V to 6.0V Peak GATE Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1A ESD Classification Human Body Model (Per JESD22-A114C.01) . . . . . . . . . . .2000V Machine Model (Per EIA/JESD22-A115-A) . . . . . . . . . . . . . .200V Charged Device Model (Per JESD22-C191-A) . . . . . . . . . .1000V Thermal Information Thermal Resistance (Typical, Note 1) θJA (°C/W) SOIC Package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100 MSOP Package . . . . . . . . . . . . . . . . . . . . . . . . . . . . 130 Maximum Junction Temperature . . . . . . . . . . . . . . . . -55°C to 150°C Maximum Storage Temperature Range . . . . . . . . . . . -65°C to 150°C Maximum Lead Temperature (Soldering 10s) . . . . . . . . . . . . . 300°C (SOIC, MSOP - Lead Tips Only) Operating Conditions Temperature Range ISL8843AxZ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .-40°C to 105°C ISL8843MxZ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .-55°C to 125°C Supply Voltage Range (Typical) ISL8843 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9V - 30V CAUTION: Stresses above those listed in “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress only rating and operation of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied. NOTES: 1. θJA is measured with the component mounted on a high effective thermal conductivity test board in free air. See Tech Brief TB379 for details. 2. All voltages are with respect to GND. Electrical Specifications ISL8843A - Recommended operating conditions unless otherwise noted. Refer to Block Diagram and Typical Application schematic. VDD = 15V, RT = 10kΩ, CT = 3.3nF, TA = -40 to 105°C (Note 3) Typical values are at TA = 25°C TEST CONDITIONS MIN TYP MAX UNITS PARAMETER UNDERVOLTAGE LOCKOUT START Threshold STOP Threshold Hysteresis Startup Current, IDD Operating Current, IDD Operating Supply Current, ID REFERENCE VOLTAGE Overall Accuracy Long Term Stability Current Limit, Sourcing Current Limit, Sinking CURRENT SENSE Input Bias Current CS Offset Voltage COMP to PWM Comparator Offset Voltage Input Signal, Maximum Gain, ACS = ∆VCOMP/∆VCS CS to OUT Delay ERROR AMPLIFIER Open Loop Voltage Gain Unity Gain Bandwidth Reference Voltage 8.0 7.3 VDD < START Threshold (Note 4) Includes 1nF GATE loading - 8.4 7.6 0.8 90 2.9 4.75 9.0 8.0 125 4.0 5.5 V V V µA mA mA Over line (VDD = 12V to 18V), load, temperature TA = 125°C, 1000 hours (Note 5) 4.925 -20 5 5.000 5 - 5.050 - V mV mA mA VCS = 1V VCS = 0V (Note 5) VCS = 0V (Note 5) 0 < VCS < 910mV, VFB = 0V -1.0 95 0.80 0.97 2.5 - 100 1.15 1.00 3.0 35 1.0 105 1.30 1.03 3.5 55 µA mV V V V/V ns (Note 5) (Note 5) VFB = VCOMP 60 1.0 2.475 90 1.5 2.500 2.530 dB MHz V 4 FN9238.1 January 3, 2006 ISL8843 Electrical Specifications ISL8843A - Recommended operating conditions unless otherwise noted. Refer to Block Diagram and Typical Application schematic. VDD = 15V, RT = 10kΩ, CT = 3.3nF, TA = -40 to 105°C (Note 3) Typical values are at TA = 25°C (Continued) TEST CONDITIONS VFB = 0V VCOMP = 1.5V, VFB = 2.7V VCOMP = 1.5V, VFB = 2.3V VFB = 2.3V VFB = 2.7V Frequency = 120Hz, VDD = 12V to 18V (Note 5) MIN -1.0 1.0 -0.4 4.80 0.4 60 TYP -0.2 80 MAX 1.0 VREF 1.0 UNITS µA mA mA V V dB PARAMETER FB Input Bias Current COMP Sink Current COMP Source Current COMP VOH COMP VOL PSRR OSCILLATOR Frequency Accuracy Frequency Variation with VDD Temperature Stability Amplitude, Peak to Peak RTCT Discharge Voltage (Valley Voltage) Discharge Current OUTPUT Gate VOH Gate VOL Peak Output Current Rise Time Fall Time GATE VOL UVLO Clamp Voltage PWM Maximum Duty Cycle Minimum Duty Cycle NOTES: Initial, TA = 25°C TA= 25°C, (F30V - F9V)/F30V (Note 5) Static Test Static Test RTCT = 2.0V 48 6.5 51 0.2 1.75 1.0 7.8 53 1.0 5 8.5 kHz % % V V mA VDD - OUT, IOUT = -200mA OUT - GND, IOUT = 200mA COUT = 1nF (Note 5) COUT = 1nF (Note 5) COUT = 1nF (Note 5) VDD = 5V, ILOAD = 1mA COMP = VREF COMP = GND - 1.0 1.0 1.0 20 20 - 2.0 2.0 40 40 1.2 V V A ns ns V 93.5 - 95 - 0 % % 3. Specifications at -40°C and 105°C are guaranteed by 25°C test with margin limits. 4. This is the VDD current consumed when the device is active but not switching. Does not include gate drive current. 5. Guaranteed by design, not 100% tested in production. Electrical Specifications ISL8843M - Recommended operating conditions unless otherwise noted. Refer to Block Diagram and Typical Application schematic. VDD = 15V, RT = 10kΩ, CT = 3.3nF, TA = -55 to 125°C (Note 6), Typical values are at TA = 25°C TEST CONDITIONS MIN TYP MAX UNITS PARAMETER UNDERVOLTAGE LOCKOUT START Threshold STOP Threshold Hysteresis Startup Current, IDD Operating Current, IDD Operating Supply Current, ID REFERENCE VOLTAGE Overall Accuracy 8.0 7.3 VDD < START Threshold (Note 7) Includes 1nF GATE loading - 8.4 7.6 0.8 90 2.9 4.75 9.0 8.0 125 4.0 5.5 V V V µA mA mA Over line (VDD = 12V to 18V), load, temperature 4.900 5.000 5.050 V 5 FN9238.1 January 3, 2006 ISL8843 Electrical Specifications ISL8843M - Recommended operating conditions unless otherwise noted. Refer to Block Diagram and Typical Application schematic. VDD = 15V, RT = 10kΩ, CT = 3.3nF, TA = -55 to 125°C (Note 6), Typical values are at TA = 25°C (Continued) TEST CONDITIONS TA = 125°C, 1000 hours (Note 8) MIN -20 5 TYP 5 MAX UNITS mV mA mA PARAMETER Long Term Stability Current Limit, Sourcing Current Limit, Sinking CURRENT SENSE Input Bias Current CS Offset Voltage COMP to PWM Comparator Offset Voltage Input Signal, Maximum Gain, ACS = ∆VCOMP/∆VCS CS to OUT Delay ERROR AMPLIFIER Open Loop Voltage Gain Unity Gain Bandwidth Reference Voltage FB Input Bias Current COMP Sink Current COMP Source Current COMP VOH COMP VOL PSRR OSCILLATOR Frequency Accuracy Frequency Variation with VDD Temperature Stability Amplitude, Peak to Peak RTCT Discharge Voltage (Valley Voltage) Discharge Current OUTPUT Gate VOH Gate VOL Peak Output Current Rise Time Fall Time GATE