As the industry leader in GaN controllers for fast charging.
Southchip released the highly integrated GaN power chips, SC3050 and SC3056.
which integrates the controller, driver, and power chip in a small package of DFN 5*6.
Today let’s see this Southchip 33W GaN module.
It is composed of three PCBs.
A transformer, filter inductor and output filter capacitor are inside.
There are fuses, common mode chock, high-voltage filtering capacitors and other components at the input.
The transformer is separately welded to this small board.
Its magnetic core adopts Bo Zhong Da.
There is sufficient safety distance between the transformer and the USB-C receptacle port,
which is easy to add insulation material.
There are two high-voltage filtering capacitors for input filtering are next to it.
The Southchip’s GaN chip SC3056 and an optocoupler are on the back.
On the right side of the optocoupler, here are two Y capacitors in series.
To reduce the size of the charger, the folding pins can be placed in the empty space on the left.
There is an isolation groove on the back of the bottom PCB.
A rectifier bridge is on the high-voltage circuit.
And the protocol chip, VBUS switching transistor
and synchronous rectifier tube are on the low-voltage circuit.
Its length is 22mm (0.86 inches), width is 23mm (0.9 inches), and height is 28mm (1.1 inches).
The power density is 2.22 W/m3.
Compare with Apple’s 20W charger.
You can see how small it is.
This GaN chip comes from Southchip SC3056, which adopts DFN 5*6 package.
Its Pins are divided into different blocks, which can separate power pins and control pins.
SC3056 is a high frequency, quasi-resonant flyback PWM converter.
which can achieve high efficiency and reliability.
The converter has built-in high voltage start-up circuit.
Therefore, extremely low standby power consumption and super-fast start-up time can be obtained.
At the same time, it provides an adaptive switching frequency fold-back to achieve higher
efficiency in the whole loading range.
It operates in QR and DCM with valley switching for high efficiency.
And at no load, the IC will operate in burst mode to reduce power consumption.
SC3056 integrates GaN switching transistor of 650V withstand voltage,
as well as high-voltage start-up circuit and internal soft start.
It also integrated segment power supply circuit for extra-wide output range.
And has ultra-low operation current under burst/fault mode.
Its switching frequency can be up to 175KHz.
And it can support Frequency Jitter for EMI improvement and valley switching,
To reduce the power consumption and improve efficiency,
it’ll run burst mode when lightly loaded and no loaded.
The protection is comprehensive, including internal over-temperature protection,
VDD over voltage protection, VDD under-voltage lockout, cycle by cycle current limiting,
two level overcurrent protection, output over-voltage protection, output short protection and overload protection.
And then, the synchronous rectifier controller, which comes from Southchip SC3503,
is on the back of the synchronous rectifier tube.
It can support turn-on detection and fast turn-off.
You do not need auxiliary winding for power supply
And the output voltage can even down to 0V.
The Patented programmable turn-on detection circuitry can prevent MOSFET from mistake turn-on.
And also, it compliant with multiple types of MOSFETs and support various mode.
Southchip SC2151A is a PD and DP/DM fast charge controller with internal feedback compensation integrated
and adopts 16-pin QFN 4*4mm package.
It complies with the latest Type-C and PD 3.0 standards and supports the proprietary
high voltage fast charge protocols with DP/DM interface,
suitable for various adapter applications.
It contains a 32-bit high-performance micro-controller core with 24kB OTP and 2kB RAM.
The controller integrates the USB PD physical layer, Type-C detection, DP/DM physical layer,
VCONN supply for various fast-charging protocols.
In addition, Southchip SC2151A integrates discharging paths,
programmable feedback compensation, voltage & current detection, 10-bit high-performance ADC,
two 10-bit DACs, NMOS gate driver, I2C interface, and protection circuit.
It provides a simple and efficient solution
of protocol controller for applications such as adapters.
OK, that would be the analysis of Southchip 33W GaN charger module.
This Southchip module considered the application of charger from the design
And it realized the simplified and efficient design of GaN charger.
Southchip will also release another USB PD fast charging solution using GaN technology
for secondary synchronous rectifier,
to achieve high-frequency and high-efficiency charger design of all GaN.
Well, that’s all for today’s video.
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Bye.