Multi-port chargers have many advantages such as multiple interfaces, good compatibility, and can charge multiple devices at the same time, and have always been the main shipment type of gallium nitride fast charging market. Many chip OEMs have invested a lot of resources in the protocol buck of multi-port charging to create a compatibility and full-featured chip for multi-port chargers to meet the needs of users for multi-port simultaneous fast charging.
Silan Microelectronics has introduced a protocol chip for multi-port fast charging, SD59D15, which supports four PWM drive signal outputs, can support dual independent buck or one buck application, and supports 2C1A triple applications. SD59D15 is compatible with PD3.0, PPS, QC4+, FCP, SCP, SFCP, AFC and other fast charging protocols, and has good compatibility.
First, Silan Micro released three SoC chips
Silan Microelectronics released the SD59D15 protocol chip, which contains two synchronous buck converters and supports a patented control architecture linked to flyback power and supports 100% duty cycle. The charger output voltage can be reduced when the charger is unloaded or the output is 5V, reducing no-load losses and improving efficiency.
The SLAN Micro SD59D15 is available in a QFN6*6-52 package, and one chip supports dual independent USB-C interfaces. The built-in four PWM outputs can be configured for a single synchronous buck or two independent synchronous buck applications to meet the needs of dual or triple port fast charging applications without the need for a separate buck protocol chip for each port.
Silan Micro SD59D15 is suitable for multi-port PD fast charging applications, the chip internal supports dual current sampling and output voltage sampling, built-in three-way port load switch control, can achieve independent interface control.
Silan Micro SD59D15 integrates multiple PWM signal outputs, built-in timer and ADC, integrated SCP fast charge protocol module and BMC module for USB PD. It also integrates a rich auxiliary computing unit for complex function computing functions.
The SD59D15 chip has UART and I2C interfaces to communicate with other chips, and the chip has built-in output overvoltage, overcurrent, and overtemperature protection to ensure safe use. It also supports mobile phone access detection and removal detection, and synchronously switches low-power modes to reduce the no-load power consumption of the charger.
The figure shows the SD59D15's dual independent buck application, which can realize the dual independent buck control of 2C1A through a single chip, saving the number of charger secondary components. At the same time, SD59D15 supports buck-boost applications, can be used for dual-port charger, charger internal AC-DC by SD59D15 control output voltage, output a USB-C port, the other USB-C port by SD59D15 built-in buck-boost voltage regulation voltage output.
Second, Silan Micro launched a 65W three-port fast charging reference design
Based on the SD59D15, Silan Micro has launched a 65W 2C1A three-port fast charging reference design, which benefits from the highly integrated SD59D15 buck protocol chip, which has a high degree of integration and does not need to solder a separate small board for the charger secondary stage, thereby reducing the cost of the charger.
This charger is a long strip design, using a planar transformer, but the secondary does not have the previous multi-port fast charging multiple independent buck boards.
The charger input has a fuse, NTC surge suppression resistor, two-stage common mode inductor, high voltage filter electrolytic capacitor, etc.
The planar transformer core is bonded with two cores, and inside is the circuit board of the planar transformer.
On the output side, there are two magnetic ring buck inductors and corresponding solid capacitors, one for AC-DC output filtering and the other two for independent output interface filtering.
The back of the charger is a common flyback scheme, which supplies two independent bucks with a fixed voltage via the 431 regulated feedback output.
The length of the measured Tesland Micro 65W three-port reference design is 61.42mm.
The width is 33.35mm.
The thickness is 21mm.
The overall charger size is similar to the 65W Gallium Nitride fast charging volume.
The primary PWM controller features the MK2697, a QR PWM controller optimized for PD/fast charging applications. The controller's wide VCC operating voltage range (9V-90V) allows it to cover the PD/PPS output range from 3.3V to 23V without the need for additional auxiliary windings or linear buck circuitry.
The primary switch tube adopts Anhai ASM60R330E, which is a super junction MOS, NMOS, withstand voltage 650V, conductivity resistance 330mΩ, and adopts DFN8X8 package.
Charger secondary synchronous rectifier silk screen printing S1008.
The output adopts the NMOS tube of the silk screen printing 7446 for synchronous rectification and buck, and a total of four corresponding to two independent synchronous bucks.
Charging head net summary
Silan micro three-port SoC chip SD59D15 is a highly integrated charger secondary protocol scheme, which supports dual independent buck output or single buck output, compared with the conventional buck protocol scheme, can greatly simplify the charger secondary design, with higher integration and flexibility.
Through the observation of the Silan Micro 65W three-port fast charging scheme, it is found that this fast charging scheme does not use the traditional protocol buck plate in the secondary stage, but reduces the space and area occupation of the buck circuit in the charger through a highly integrated chip. This reduces the difficulty of assembling the charger and reduces the overall cost. The advantages of the high integration of the Silan Micro SD59D15 are fully reflected.