Technical Brief 495 ISL62882C, ISL62883C Connection Guidelines for 1-Phase Configuration Introduction Application Recommendation The ISL62882C can be configured for either 2-phase or 1-phase operation. The ISL62883C can be configured for 3-phase, 2-phase or 1-phase operation. Per the datasheet, the configuration for 1-phase operation is defined as ISEN2 is tied to +5V. In the case of the ISL62883C, the PWM3 pin is also tied to +5V and should be for the purposes of this document. If only ISEN2 is tied to +5V and ISEN1 is left floating, there have been rare occurrences where the configuration is interpreted as a 2-phase configuration, which will cause a system shutdown. In order to prevent the possibility of the controller interpreting the configuration incorrectly, we recommend both ISEN1 and ISEN2 be tied to +5V. This will avoid any chance of a misinterpretation of the configuration programmed. The controller will always interpret the 1-phase configuration correctly and this will avoid any potential shutdown issues. The feasibility of this application recommendation has been validated and proved by simulations and bench tests. V +5 V +5 VDD VCCP R bias A simplified application circuit using the ISL62882C is shown in Figure 1, in a 1-phase configuration following these guidelines. Vin V IN R B IA S R ntc NTC °C B O O T2 PGOOD V R _TT# C L K _EN # V ID s P S I# D P R S LP VR V R _O N VW PGOOD V R _TT# C L K _EN # V ID <0:6> P SI# D P R S LPV R V R _O N U G A TE 2 P H A S E2 LG A TE2 V S SP 2 ISE N 2 Vin B O O T1 IS L62882C R fset COMP FB 2 FB U G A TE 1 PH A SE 1 LG A TE1b L G A TE1a V S SP 1 L Vo ISE N 1 R droop V SE N ISU M + R sum VC C S E N S E V S SS E N S E Rn Cn R TN R im o n IM O N °C Ri IM O N (B ottom P ad) V SS IS U M - FIGURE 1. SIMPLIFIED 1-PHASE APPLICATION CIRCUIT Intersil Corporation reserves the right to make changes in circuit design, software and/or specifications at any time without notice. Accordingly, the reader is cautioned to verify that the Application Note or Technical Brief is current before proceeding. For information regarding Intersil Corporation and its products, see www.intersil.com August 6, 2013 TB495.0 1 CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures. 1-888-INTERSIL or 1-888-468-3774 | Copyright Intersil Americas LLC 2013. All Rights Reserved Intersil (and design) is a trademark owned by Intersil Corporation or one of its subsidiaries. All other trademarks mentioned are the property of their respective owners.