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    www.irf.com 1AN-1107 Application Note AN-1107 IRS218(4,44) and IR218(4,44) Comparison By Jason Nguyen, Min Fang, David New Table of Contents Page  Introduction..........................................................................................1 Block Diagrams....................................................................................2 Electrical Characteristic Differences.....................................................3 Figures.................................................................................................4 Summary..............................................................................................6 Introduction The IRS218(4,44) are new HVIC products that replace the IR218(4,44) HVICs and are pin-to-pin compatible with their corresponding predecessor. In many cases, little or no change is necessary to use the new product. This application note describes the various differences between the IRS218(4,44) and the IR218(4,44) HVICs. The IRS218(4,44) are high voltage, high speed power MOSFET and IGBT drivers with independent high and low side referenced output channels. Proprietary HVIC and latch immune CMOS technologies enable ruggedized monolithic construction. The logic input is compatible with standard CMOS or LSTTL outputs, down to 3.3 V logic. The output drivers feature a high pulse current buffer stage designed for minimum driver cross-conduction. The floating channel can be used to drive an N-channel power MOSFET or IGBT in the high side configuration which operates up to 600 V. There are no functional changes between the IRS218(4,44) and the IR218(4,44), however the IRS218(4,44) design has eliminated the input zener clamp diode.    www.irf.com 2AN-1107 Block Diagrams The IRS2184 and the IR2184 share the same block diagram. The IRS21844 and theIR21844 share the same block diagram. There are no functional changes between corresponding part numbers.    www.irf.com 3AN-1107 Electrical Characteristic Differences All measurement conditions remain unchanged unless noted. Parameters not mentioned in this document have not changed. Absolute Maximum Ratings Symbol min max min max V B -0.3625-0.3620 (Note1)V S V B  - 25V B  + 0.3V B  - 20V B  + 0.3V CC -0.325-0.320 (Note1)V IN V SS  - 0.3V SS  + 10V SS  - 0.3V CC  + 0.3V SS V CC  - 25V CC  + 0.3V CC  - 20V CC  + 0.3Logic ground (21844 only)Logic input voltage High side floating absolute voltageVLow side fixed supply voltage Parameter High side floating supply offset voltage UnitsIR218(4, 44) IRS218(4,44)Definition  Note1: In IRS218(4,44), all supplies are fully tested at 25 V and an internal 20 V clamp exists for each supply. The 20 V, internal clamp improves the IC survivability against supply transient spikes but at the same time reduces the absolute maximum rating to 20 V. In the IRS218(4,44), the input pins are no longer internally clamped with 5.2 V zener diodes, therefore the maximum absolute rating for V IN  is increased to V CC +0.3 V. In IR218(4,44) applications where the 5.2 V clamp is used to protect the microcontroller output, an external clamp is needed when the IR218(4,44) is replaced by the IRS218(4,44). Recommended Operating Conditions Symbol min max min max V IN V SS  - 0.3V SS  + 5V SS  - 0.3V CC V Logic input voltage ParameterUnitsIR218(4,44) IRS218(4,44)Definition  In the IRS218(4,44), the input pins are no longer internally clamped with 5.2 V zener diodes, therefore the recommended operating condition for V IN  is increased to V CC . Dynamic Electrical Characteristics There are no changes in the Dynamic Electrical Characteristics.    www.irf.com 4AN-1107 Static Electrical Characteristics Symbol Definition min typ max min typ max V IH Logic "1" input voltage (V CC  = 10 V to 20 V)2.7--2.5--V IL Logic "0" input voltage (V CC  = 10 V to 20 V)--0.8--0.8V SD,TH+ SD  input positive going threshold 2.9--2.5--V SD,TH- SD  input negative going threshold --0.8--0.8--1.2--1.2--0.1--0.2Io = 0 mAIo = 0 mAVV OL Low level output voltage, V O Io = 0 mAIo = 20 mAV OH High level output voltage, V BIAS  - V O ParameterUnitsIRS218(4,44)IR218(4,44)  With the IRS218(4,44), 1. The V IH  and V SD, TH+ are reduced to 2.5 V for better 3.3 V logic compatibility. 2. The V OL  is tested using a new standardized test condition of Io= 20 mA. Figures This figures shown in this section compare figures shown in the IR218(4,44) (left column) and IRS218(4,44) (right column) datasheets. Illustrations that have not changed between the two datasheets have not been included in this section. IR218(4,44) IR218(4,44)    www.irf.com 5AN-1107
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