Weltrend Announces Availability of Ultra-Small GaN-based USB PD Power Adapter Reference Design
|Hsinchu, Taiwan, March 1, 2022 – Weltrend Semiconductor (TWSE: 2436) today announced the availability of GaN-based power adapter reference design with WT7162Rx series high frequency multi-mode flyback PWM controllers. The reference design enables fast design of ultra-small form factor USB PD power adapters.|
|The WT7162Rx series chipsets are highly integrated and high frequency flyback PWM controllers capable of multi-mode operations including quasi-resonant (QR) and discontinuous conduction mode (DCM) with valley switching. The chips improve the overall efficiency and optimize the product performance while greatly reduce component count and costs.|
|The controllers operate in QR switching mode during high output power and reduce switching frequency to support valley switching in DCM during medium/low output power, allowing the charger to achieve the optimal conversion efficiency over the full output power range.|
|For the safety protections of USB PD charger and power adapters, the WT7162Rx series chipsets provide comprehensive protection mechanisms such as X-capacitor discharge protection, AC mains under-voltage protection (BNI/BNO), output over-voltage protection (OVP), output short-circuit protection (SCP), internal over-temperature protection (OTP), output over-load protection (OLP) and etc. Moreover, adaptive over-power protection (OPP) and adaptive green mode for optimal efficiency are provided for wide output voltage application.|
|This series of control chips includes WT7162RH and WT7162RG. The WT7162RH is specially used for super junction MOSFET while WT7162RG provides a 6V clamped gate voltage for directly driving new-generation compound semiconductor gallium nitride (GaNFET) power switches.|
|The reference design is a 60W USB PD adapter (5V/3A; 9V/3A; 12V/3A; 20V/3A; PPS 3.3V~21V/3A). The design includes WT7162Rx PWM controller with ultra-high voltage (UHV) startup, WT7131A SR controller supporting CCM/DCM high frequency synchronous rectification, and WT6636F USB PD protocol controller, together with GaNFET power switch.|
|It achieves both high efficiency and small factor (L: 43mm/W: 43mm/H: 22mm), and passes the EMC/ESD/Surge test, while supporting USB PD 3.0 PPS and Qualcomm’s Quick Charge 4+ fast charge protocols.|
Fig. Weltrend 60W ultra-small GaN-based USB PD adapter reference design
|About Weltrend Semiconductor Inc.
Founded in 1989 in the "Silicon Valley of Taiwan", the Science-Based Industrial Park (SBIP) in Hsinchu, Weltrend Semiconductor, Inc. (TWSE: 2436) is a leading fabless semiconductor company, also known as IC design house, specializing in the planning, design, testing, application development and distribution of mixed-signal/digital IC products across multiple applications. For more information, please visit www.weltrend.com.