Digital Adaptive Multi-Mode Synchronous Rectifier Controller

HY901

Application

USB PD and Quick Chargers
AC/DC offline adaptor

DESCRIPTION

     HY901 is a smart digital control synchronous rectifier controller functioning as diode emulator. It drives the standard N-channel Power MOSFET to replace Schottky in order to achieve the high efficiency. HY901 incorporates the digital control technology to optimize the multi-mode operation at DCM/PFM/CCM/QR in the different applications. The digital control technology further enhances the robust CCM operation. Adaptive pre-turning off scheme not only guarantees the fast transition but also minimizes switching loss. The adaptive pre-turn off scheme optimizes the EMI due to the soft SR MOSFET switching off transition. The configurable volt-second threshold through INTG pin avoids SR MOSFET mis-trigger transition due to the parasitic ring under DCM/QR mode. HY901 integrates the multi features to minimize the BOM and optimize the performance.  

     HY901 is available with SOT23-6 package.

FEATURES


·  Low-side synchronous rectification without auxiliary winding

·  Supports Multi-Mode operation: DCM, CCM, PFM and QR

·  Wide output voltage range: 2.8-25V

·  Wide VCC bias range up to 8V

·  High voltage drain sensing up to 120V

·  High current gate driver compatible with various MOSFET

·  Driver voltage clamped to 8.0V

·  Adaptive pre-turn off driver speeding up turn off transitio

·  Selectable option for T_OFF_MIN  

·  Selectable option for pre-off threshold

·  Self-supply to maintain operation with output voltage as low as 2.8V

·  Shoot through protection (STP)

·  Optimized switching loss and EMI

·  Low quiescent current 

图片1.png

                                                            Fig 3.  Typical Application Diagram


Option Table

Product

HY901A

HY901B

T_ON_MIN

1.0 μs

T_OFF_MIN

1.25 μs


2.5 μs


DRV pre-off regulate threshold

-40 mV


-60 mV


 

           

SOT23-6 (Top view)   

     图片1.png

   Fig 4.  Package Diagram


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Functional Pin Definition

Pin

Name

Description

1

OUT

Gate drive output.  Connect OUT with the gate of external MOSFET through a resistor in the application. The PCB trace between OUT and gate of SR MOSFET should be designed as short as possible.

2

VSS

Ground. VSS is used as a MOSFET source sense reference. The PCB trace between VSS and source of SR MOSFET should be designed as short as possible.

3

VDS

MOSFET drain voltage sense. The PCB trace between VDS and drain of SR MOSFET should be designed as short as possible.

4

VIN

HV bias input. VIN pin connected to the converter output voltage.

5

INTG

Connect INTG pin to VSS pin through a configuration resistor to setup the integral  time after SR MOSFET turns off. This prevents the SR controller from turning on falsely by ringing below the turn-on threshold at VDS pin under DCM/QR mode.

6

VCC

IC bias output. VCC is the supply of the HY901. A typical 1uF to 2.2uF X7R bias capacitor is recommended to be designed in applications 


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