On October 30th, Beijing time, the new iPad Pro was released as scheduled. It is divided into two different sizes of IPS retina screens: 11 inches and 12.9 inches, equipped with powerful A12X processor and M12 co-processor, and the HOME button is removed from the frame. Face ID is added to the full screen without bangs. In addition, the Lightning port and headphone jack have been abandoned and replaced with a USB-C port, which supports 4K video output, supports USB PD fast charging, and can output power in reverse to other devices (such as charging an iPhone). In terms of accessories, it comes standard with an 18W USB PD charger and a USB-C to USB-C data cable.
Share the 18W PD fast charging source application scheme based on PN8161+PN8307H for you.
Program Highlights
Save more than 10 peripherals:
No starting resistance, no CS detection network, both primary and secondary sides realize SOP8 power integration;
Meet CoC V5 Tier 2:
Patented high-voltage startup to achieve 30mW standby power consumption; the working curve adapts to the output voltage, and the average efficiency margin under different output voltages is greater than 4 points;
Excellent EMC performance:
The frequency jittering amplitude adapts to the load to improve conduction; DCM/QR working mode avoids the reverse recovery problem of the secondary rectifier and improves radiation;
3.3~12V wide output voltage range:
PN8161/PN8307H has a wide power supply range, no need for additional LDO voltage regulation;
The protocol chip can be used arbitrarily:
SSR architecture, the solution is easy to meet PD3.0/QuickCharge 4+.
Package and pin layout
The PN8161 integrates a quasi-resonant current mode controller and a power MOSFET, which is dedicated to AC-DC switching power supplies with high performance and simplified peripheral components.
PN8161
PN8307H
Demo physical map
Typical application diagram of the scheme
Program Features
Input voltage: 90~265Vac
Output power: 18W
Output specifications: 12V1.5A; 9V2A; 5V3A
Average efficiency: meet CoC V5-2, 4 point margin
PCBA size: 48.0mm*36.0mm*14mm
It has brown in/out, output overvoltage protection, precise overtemperature protection, cycle-by-cycle overcurrent protection, secondary rectifier short circuit protection, etc.
Test Data
1. Energy efficiency test
Test conditions: the test point is the PCB side
2. Temperature rise test
Test conditions: 45 ℃ ambient temperature, no wind, with shell, air natural convection, the output is 5.9V3A
(Temperature data: CH1PN8161; CH2PN8307H; CH3 core; CH4 primary enameled wire; CH5 triple insulated wire; CH6 shell)
3. Protection function
EMC testing
EMI conduction and radiation meet the requirements of EN55022 Class B standard, and the margin is greater than 6dB
ESD meets IEC61000-4-2, 8kV/15kV level requirements
EFT meets IEC 61000-4-4: 2004, 4kV class requirements
Surge meets IEC 61000-4-5:2005, 1kV class requirements
AC insulation meets 3.75kV requirements
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