Product Description

ISSUE DATE: 2020-2-19
Revision No.: 0.1
Specification No: WTM1B15
Page: 5 of 16
MODEL NO：WTM1B15 Transmitter of WPC QI EPP
ENGINEERING SPECIFICATION SHEET
2.2 INPUT REQUIREMENT
The power supply must operate on a DC input voltage 19V with ±5% tolerance. Input current
should lower than 1A.
Input Range Minimum Nominal Maximum Unit
18.05 19 19.95 Vdc
Table 1 - Input Voltage Range
2.3 OUTPUT REQUIREMENT
The wireless charger can support WPC qi V1.2.4 EPP 15W , downward support BPP 5W, Apple
7.5W, Samsung Fast Charge. The following specifications are defined with RX- WRM1A15
12V/1.25A 15W Output.
2.4 NO LOAD CONSUMPTION
Vin Load Power consumption
19V No Receiver < 0.5W
Table 2 - No load consumption
2.5 EFFICIENCY
The efficiency shall be ≧75% at 19V maximum loading, 12V/1.25A efficiency measurements are
performed at coil center with 2mm vertical distance between TX coil and RX IDT P9221 COIL.
Load Efficiency Receiver
15W 75% IDT P9221
Table 3 - Efficiency
2.6 FREQUENCY
The Operating Frequency is 120~130 kHz