DATASHEET ISL78420 FN8296 Rev 4.00 100V, 2A Peak, Half-Bridge Driver with Tri-Level PWM Input and Adjustable September 29, 2016 Dead-Time The ISL78420 is a 100V, 2A high frequency half-bridge NMOS Features FET driver with a tri-level PWM input. With an operating supply 114VDC bootstrap supply maximum voltage range of 8V to 14V and integrated high-side bootstrap bias, it supports driving the high-side and low-side NMOS in 100V half- 2A source and sink driver for 100V half-bridge NMOS FETs bridge applications. Programmable dead-time prevents shoot-through This driver is designed to work in conjunction with the adjustable from 35ns to 220ns with a single resistor ISL78220 and ISL78225 Multi-Phase Interleaved Boost PWM Unique tri-level PWM input logic enables phase shedding Controller and the ISL78226 6-Phase 12V/48V Bidirectional when using multiphase PWM controllers (e.g. Synchronous PWM Controller. It can also be used in ISL78220/225/226) applications where a standard half-bridge driver is needed. On-chip 1 (dynamic) bootstrap diode This driver has a programmable dead-time to ensure 10ns rise and fall times with 1000pF load break-before-make operation between the high-side and low- 8V to 14V operating voltage range side MOSFET. A resistor is used to set the dead-time from 35ns to 220ns. V and Boostrap supply Undervoltage Lockout (UVLO) DD The PWM pins tri-level input allows control of the high-side 14 Ld HTSSOP package compliant with 100V conductor and low-side drivers with a single pin. When the PWM input is spacing guidelines per IPC-2221 at logic high, the high-side bridge FET is turned on and the low- AEC-Q100 qualified side FET is off. When the input is at logic low, the low-side bridge FET is turned on and the high-side FET is turned off. Applications When the input voltage is in mid-level state, both the high and Automotive applications low-side bridge FETs are turned off. The enable pin (EN), when low, also turns both bridge FETs off. This EN input can be used 12V/48V bi-directional converter (ISL78226) when the controller driving the ISL78420 does not utilize a tri- Multiphase boost (ISL78220/225) level output. Both PWM and EN logic inputs are V tolerant. DD Class-D amplifiers The ISL78420 is offered in a 14 Ld HTSSOP package and complies with 100V conductor spacing per IPC-2221. The Related Literature device is Automotive AEC-Q100 qualified for the temperature For a full list of related documents, visit our web page range of -40C to +125C. - ISL78420 product page 320 240 48V 12V 200 T = -40C 160 140 HB T = +125C PWM 120 HO VDD HS 100 EN ISL78420 RDT 80 T = +85C PWM1 LO VSS PWM2 ISL78226 60 PWM3 T = +25C 6Phase PWM4 DCDC PHASE 1 PWM5 Controller 40 PHASE 2 PWM6 PHASE 3 T = -40C to +125C PHASE 4 A PHASE 5 20 PHASE 6 8 16 24 32 40 48 56 64 72 80 RESISTOR ON RDT PIN (k ) FIGURE 1. NMOS DRIVER FOR 6-PHASE BIDIRECTIONAL BUCK AND FIGURE 2. DEAD-TIME vs TIMING RESISTOR BOOST CONVERTER FN8296 Rev 4.00 Page 1 of 19 September 29, 2016 DEAD-TIME DELAY (ns)ISL78420 Block Diagram VDD HB BOOT DIODE UNDER HO LEVEL VOLTAGE SHIFT HS 6.1V DELAY - PWM + UNDER VOLTAGE - + DELAY LO VSS EN 210k RDT ISL78420 ISOLATED EPAD FIGURE 3. ISL78420 BLOCK DIAGRAM Pin Configurations ISL78420ARTAZ ISL78420AVEZ (10 LD 4X4 TDFN) (14 LD TSSOP) TOP VIEW TOP VIEW VDD 1 10 LO VDD NC 1 14 VSS NC 2 9 NC 2 13 LO HB EPAD 3 8 PWM HB 3 VSS 12 4 HO 7 EN HO 4 EPAD 11 PWM HS 5 6 RDT HS 5 10 EN NC 6 9 RDT NC 7 8 NC FN8296 Rev 4.00 Page 2 of 19 September 29, 2016 NOT RECOMMENDED FOR NEW DESIGNS 165k 235k