Quick Charge 2.0 Solution_15W USB Adapter LD5718_DB-01 Subject
Model Name
LD5718 Demo Board
LD5718_DB-01 (5V/2A, 9V/1.67A, 12V/1.25A)
Key Features
Quick Charge 2.0 Compliance with LD8108
Flyback topology with PSR Control
Constant Voltage
Constant Current
High Efficiency with QR Operation (Meet DOE-6)
Compatible to PE+
1 Leadtrend Technology Corporation LD5718_DB-00, March 2015
Quick Charge 2.0 Solution_15W USB Adapter LD5718_DB-01 USB Adapter Design Check List MODEL NAME
LD5718_DB-01
TOTAL PAGE:
19(Page)
Engineer
Chris
DATE:
2015/3/26
NO.
TEST ITEM
SPEC.
NAME.
PAGE
RESULT
1
Input Characteristics – Efficiency
>78.7%
Chris
8
~
10
PASS
2
Input Characteristics - Power Saving
78.7% (DOE-6, 5V/2A)
PASS
3.1. Input Characteristics 3.1.1. Efficiency
Note: Measured at PCB
AC Input 115 Vac 60 Hz
230 Vac 50 Hz
Pin (W)
Po (W)
Vo (V)
Io (A)
Efficiency
12.647 9.286 6.131 3.060 .1.231 12,49 9.31 6.183 3.106 1.273
10.436 7.728 5.1 2.5235 0.992 10.32 7.668 5.070 2.5055 0.975
5.218 5.152 5.100 5.047 4.96 5.16 5.112 5.070 5.011 4.875
2.0 1.5 1 0.5 0.2 2.0 1.5 1 0.5 0.2
82.52% 83.22% 83.18% 82.46% 80.58% 82.63% 82.36% 82.00% 80.67% 76.59%
Table 3.1.1, Efficiency @ Input Voltage = 115Vac / 230Vac/Vo=5V
Fig. 3.1.1, Load vs. Efficiency @Vo=5V
8 Leadtrend Technology Corporation LD5718_DB-01, April 2015
Average Eff. 82.84%
81.92%
Quick Charge 2.0 Solution_15W USB Adapter LD5718_DB-01 3.1.2. Efficiency with Quick Charge 2.0 Operation
Vo=9V Specification
Result
>84.13% (DOE-6, 9V/1.67A)
PASS Note: Measured at PCB
AC Input 115 Vac 60 Hz
230 Vac 50 Hz
Pin (W)
Po (W)
Vo (V)
Io (A)
Efficiency
18.19 13.52 8.99 4.54 1.268 18.05 13.50 9.04 4.536 1.298
15.553 11.625 7.725 3.806 1.01 15.516 11.590 7.708 3.800 1.003
9.313 9.281 9.251 9.226 9.181 9.291 9.257 9.231 9.205 9.116
1.67 1.2525 0.835 0.4125 0.11 1.67 1.2525 0.835 0.4125 0.11
85.50% 85.98% 85.92% 83.83% 79.64% 85.96% 85.88% 85.26% 83.71% 77.25%
Table 3.1.2, Efficiency @ Input Voltage = 115Vac / 230Vac/Vo=9V
Fig. 3.1.2, Load vs. Efficiency @ Vo=9V
9 Leadtrend Technology Corporation LD5718_DB-01, April 2015
Average Eff. 85.31%
85.20%
Quick Charge 2.0 Solution_15W USB Adapter LD5718_DB-01 Vo=12V Specification
Result
>84.13% (DOE-6, 12V/1.25A)
PASS Note: Measured at PCB
AC Input 115 Vac 60 Hz
230 Vac 50 Hz
Pin (W)
Po (W)
Vo (V)
Io (A)
Efficiency
17.73 13.25 8.83 4.503 1.257 17.56 13.19 8.87 4.546 1.263
15.266 11.419 7.588 3.785 0.996 15.234 11.391 7.584 3.778 0.991
12.213 12.180 12.141 12.111 12.005 12.187 12.147 12.122 12.091 11.938
1.25 0.9375 0.625 0.3125 0.083 1.25 0.9375 0.625 0.3125 0.083
86.10% 86.18% 85.94% 84.05% 79.27% 86.75% 86.34% 85.41% 83.12% 78.45%
Table 3.1.3, Efficiency @ Input Voltage = 115Vac / 230Vac/Vo=12V
Fig. 3.1.3, Load vs. Efficiency @ Vo=12V
10 Leadtrend Technology Corporation LD5718_DB-01, April 2015
Average Eff. 85.57%
85.41%
Quick Charge 2.0 Solution_15W USB Adapter LD5718_DB-01 3.1.3. Power Saving Specification
Result
50mW @ no load Note: Measured at PCB
AC input
No load input power
115V/60Hz
22.78mW
230V/50Hz
38.94mW
Table 3.1.4, No load input power @ Input Voltage = 115Vac / 230V
3.2. Output Characteristics 3.2.1 Constant Voltage and Constant Current Specification
Result
NA
NA Note: Measured at PCB
Vac
90
264
CV Mode
CC Mode
Vo (V)
Io (A)
Vo (V)
Io (A)
4.987 5.175 5.232 5.288 5.363 4.956 5.106 5.183 5.223 5.268
0 0.5 1 1.5 2 0 0.5 1 1.5 2
5.0 4.7 4.4 4.1 3.9 5.0 4.7 4.4 4.1 3.9
2.290 2.291 2.291 2.293 2.295 2.443 2.448 2.452 2.456 2.446
Table 3.2.1, CV-CC Regulation @ Vo=5V
11 Leadtrend Technology Corporation LD5718_DB-01, April 2015
Quick Charge 2.0 Solution_15W USB Adapter LD5718_DB-01
Fig. 1.2.1, CV-CC Curve @ Vo=5V
3.2.2 Constant Voltage and Constant Current with Quick Charge 2.0 Operation Specification
Result
NA
NA Note: Measured at PCB
115 Vac
Rated Load CV Mode (V)
CC Mode (A)
5V
5.363
2.291
9V
9.447
1.891
12V
12.354
1.419
Table 3.2.2, CV-CC Regulation with Quick Charge 2.0 Operation
12 Leadtrend Technology Corporation LD5718_DB-01, April 2015
Quick Charge 2.0 Solution_15W USB Adapter LD5718_DB-01
Fig. 3.2.2, Constant Voltage and Constant Current with QuickCharge 2.0 Operation 5V
Fig. 3.2.3, Constant Voltage and Constant Current with QuickCharge 2.0 Operation 9V
13 Leadtrend Technology Corporation LD5718_DB-01, April 2015
Quick Charge 2.0 Solution_15W USB Adapter LD5718_DB-01
Fig. 3.2.4, Constant Voltage and Constant Current with QuickCharge 2.0 Operation 12V
14 Leadtrend Technology Corporation LD5718_DB-01, April 2015
Quick Charge 2.0 Solution_15W USB Adapter LD5718_DB-01 3.3. Turn On Delay Time Input
Tturn on delay
90Vac /47Hz
51.32 msec
Specification
Result
< 3 sec
PASS
Table 3.3.1, Turn On Delay Time
CH1:Vac, CH2:Vo, CH3:Io Fig. 3.3.1, Start-up Waveforms @ 90Vac/47Hz
15 Leadtrend Technology Corporation LD5718_DB-01, April 2015
Quick Charge 2.0 Solution_15W USB Adapter LD5718_DB-01 3.4. Power Component Stress Voltage Specification Derating
No.
Item
1 2
Q2 D1
Result
normal< 95% transient
