Si3402-A-GM to Si3402-B-GM EVB Modifications Version 0.4 The Si3402-B-GM device requires component value changes from those used with the Si3402-A-GM evaluation board (EVB) reference design. Table 1 below is a summary of the required modifications. Following Table 1 are two reference schematic excerpts showing the locations of the modified component values for both the isolated (flyback) and non-isolated (buck) topologies. Table 1. Si3402-B-GM EVB modifications versus the Si3402-A-GM EVB Item Modification description Application design effect M1 Detect resistor value The former 25.5kΩ detect resistor must be replaced by 24.3kΩ change 1% M2 Classification resistor value The following 1% resistors must be used: change Class0: 681.00 or higher (It is optional to place this resistor) Class1: 140.0 Class2: 75.0 Class3: 48.7 Class4: 33.2 M3* ISO EVB DCDC 3.3V changes Flyback C8, R9 & C23 are not need—Do not populate them. C9=10nF, C21=33nF, R12=475 Ω & R8=1.1k Ω Replace D2 (DFLT15A) with DFLT30A * See Revision Notes M4 ISO EVB DCDC 5V changes Flyback C8, R9 & C23 are not need—Do not populate them. C9=3.3nF, C21=15nF, R12=0 & R8=0 (place zero Ω resistors) Replace D2 (DFLT15A) with DFLT30A M5 ISO EVB DCDC 12V changes Flyback C8, R9 & C23 are not need—Do not populate them. C9=10nF, C21=15nF, R12=0, R8=0 (place zero Ω resistor) R7=3k Replace D2 (DFLT15A) with DFLT30A M6 DCDC reference voltage change (Buck case only) Now 1.35V instead of previous 1.23V. Thus, R5 changes from 2.87kΩ 1% to 3.24kΩ 1%. R6 (1%) is modified according to this table: SILICON LABS CONFIDENTIAL

Vout Target R5 kΩ R6 kΩ Vref Vout Measured 3.3 3.24 4.64 1.35 3.37 5 3.24 8.66 1.35 4.96 9 3.24 18.2 1.35 8.93 12 3.24 25.5 1.35 11.98 M7 BUCK EVB DCDC 3.3V compensation network C19, C20 & C9 are not need—Do not populate them. changes R8 can be populated with a 0Ω resistor (creating a short between pins 3 and 4) or left unpopulated, since the ISOSSFT function is now internal (see datasheet). C7=1nF, R7=47kΩ ±20%. M8 BUCK EVB DCDC 5V compensation network C19, C20, R8 & C9 are not need—Do not populate them. changes R8 can be populated with a 0Ω resistor (creating a short between pins 3 and 4) or left unpopulated, since the ISOSSFT function is now internal (see datasheet). C7=1nF, R7=47kΩ ±20%. M9 BUCK EVB DCDC 12V compensation network C19, C20, R8 & C9 are not need—Do not populate them. changes R8 can be populated with a 0Ω resistor (creating a short between pins 3 and 4) or left unpopulated, since the ISOSSFT function is now internal (see datasheet). C7=1nF, R7=47kΩ ±20%. SILICON LABS CONFIDENTIAL

Si3402ISO (Flyback, Isolated) EVB Reference Design – 5V S e e M 2 2 4 .3 DFLT30A k Ω 0Ω 15nF 3 .3 n F 0 Ω SILICON LABS CONFIDENTIAL

Si3402 (Buck, Non-Isolated) EVB Reference Design - 5V S e e M 2 2 4 .3 k Ω 1 See nF See M M 7-M 47kΩ 6 9 SILICON LABS CONFIDENTIAL

Revision Notes 26 August 2015:  Added B5 indicating the Si3402-B-EN1 samples should be run only at room temperature  Clarified Buck (Non-Isolated) case R7 to standard value 47kΩ and relaxed to 20% tolerance 28 October 2015:  Previous version silicon errata resolved  Several components in the change list updated  Document renamed “Si3402-B RevA3 Change List_<YYYYMMDD>” 24 November 2015:  M2 and M6 components updated  Aligns with production Si3402-B-GM silicon 08 December 2015: (Version 0.3)  Changed title of doc and name of file  Clarified M7-M9 changes with regard to R8 21 March 2016: (Version 0.4)  Updated M3, the 3.3V Isolated Flyback case. o Explanation: 3.3V Flyback compensation was updated to address a small overshoot condition under no-load conditions (3.66V is allowed, the overshoot was 3.73V). The problem is fixed with revised compensation with a resulting overshoot of about 3.5V. o If a no-load condition is unlikely, the customer may keep the original M3 change recommendation:  C8, R9 & C23 are not need—Do not populate them  C9=3.3nF, C21=15nF, R12=0 & R8=0 (place zero Ω resistors)  Replace D2 (DFLT15A) with DFLT30A SILICON LABS CONFIDENTIAL