BYD BF1550 5V1A 手机充电器方案

-4-
4.Schematic
-5-
5. PCB Layout
PCB Top
PCB Bottom
Figure 2 PCB Layout 40.4 mm x 29.1 mm
-6-
6.BOM
Item Designator
Description
Qty
1
C1 C2 E-Capacitor 4.7uF/400V 8*12 105℃ ±20%
1
11
R8A SMD Resistor 0603 3K ±1%
1
12
R8
SMD Resistor 0603 17.4K ±1%
1
13
R9
SMD Resistor 1206 2.2R ±1%
1
14
R11 SMD Resistor 0805 3K ±5%
1
15
BD1 TB8S 1A 800V
1
16
D5 D6 SMD Diode D7 1A 1000V SOD123
/
/
2
10
/
/
Environmental
Meets CISPR22B/EN55022B Meets IEC950,UL1950,Class Ⅱ
15
/
/
-5
/
45
Units
Comment
Vac
/
Hz
/
mW
230Vac
V
Measured at end of USB
A
/
V
/
A
/
Measured at end of USB Iout=1A mV
Figure 1 Circuit Board Photograph
-2-
2. Design Features
AC input range 90-264Vac DC output 5V 1A Meet “75mW” no-load standby power consumption requirement Meet “COC Tier 2” Efficiency requirement at end of USB Max ripple < 80mV Meet “USB3.0” Dynamic Load Response Requirement
BF1550 For 5V1A Charger Design
Table of Contents
BF1550 for High efficiency Charger Design: (AC Input 90-264Vac,Output 5V 1A, No-Load Standby Power <75mW, Meet “COC Tier 2”efficiency)
1
6
C7
E-Capacitor 330uF/10V 6.5*8 105℃ ±20%
1
7
R1 R2 SMD Resistor 1206 2.4M ±5%
2
8
R3
SMD Resistor 0805 300R ±5%
1
9
R4
SMD Resistor 0805 360K ±5%
1
10
R5
SMD Resistor 0603 51R ±5%
Vin (Vac) 115V/ 50Hz 230V/ 50Hz
Pin (W)
0.035 0.674 1.616 3.270 4.981 6.739 0.062 0.713 1.656 3.283 4.956 6.678
Iout (mA) 0
Measure at the end of PCB
Vout (V) Pout(W) η(%)
2
17
D7
SMD Schottky Diode SS34BL 3A/40V SMB
1
18
IC1 PWM Controller IC BF1550 SOP7
1
19
L1
Inductance Filter 680uH 3.5*10mm
1
20
L2
SMD Ferrite Bead 0805 1.0K @30MHz
Ambient Temperature
/ TAMB
Min
90 47 /
4.75 0 2 1 / / /
73.77
Type
Max
Input Section
/
264
50/60
63
/
75
Output Characteristics
5
5.25
/
1.2
/
/
/
1.2
/
80
5
/
/
1.2
/
/
64.59
/
/
Time sequence
0.491 1.235
68.864 74.5773
500 750
5.000 5.050
2.5 76.1499 75.9174
3.7875 76.4225
1000
5.110
5.11 76.5199
F(KHz) 53 56
Europe COC Tier 2 Efficiency(%) :73.77( 0.0834*ln(Pno)–0.0011 * Pno + 0.609)
-10-
VOUT (V)
10. Output Ripple Voltage
Vin=115V Full Load △V=53.6mV
-11-
Vin=230V Full Load △V=41.2mV
11. Turn-on Delay Time
Vin=90V, Full Load △T=537mS
-12-
-1-
1. Introduction
This document provides a reference design for a universal AC input, 5V 1A isolated fly-back adapter. For this design the BF1550 is used. It contains the complete specification of the power supply, a detailed circuit diagram and PCB layout, the entire bill of materials required to build the power supply, drawing of the power transformer, and test data of the most important performance.
f
Standby Power
/
Output Voltage CV
Output Current
Output Voltage CC
Output Current
Ripple&Noise
Continuous Output Power
Over Current Protection
Active Mode Efficiency
5.020
0
/
AVG η(%)
100
4.920 0.492 72.997
250
4.940 1.235 76.4233
500 750
5.000 5.040
2.5 3.78
76.4526 76.1479
75.8884
1000
5.110
5.11 75.8273
0
5.010
0
/
100 250
4.910 4.940
Europe COC Tier 2 Efficiency at 10% load(%) :64.59( 0.0834*ln(Pno)– 0.00127 * Pno + 0.518)
-9-
VOUT (V)
9.CV and CC Regulation
VI Curve (Vin=115Vac/60Hz)
-3-
3. Power Supply Design Specification
The table below represents the minimum acceptable performance of the design.
Description
Symbol
Input Voltage
Vin
Line Frequency
Active Mode Efficiency at 10% load
Vout_cv Iout_cv Vout_cc Iout_cc Vripple
Pout Iout_max
η
η
Turn-on delay time
/
Hold up time
/
Conducted/Radiation EMI Safety ESD
Vin=264V, Full Load △T=136mS
5.5 5
4.5 4
3.5 3
2.5 2
1.5 1
0.5 0
0 0.2 0.4 0.6 0.8 1 1.2 1.4
IOUT (A)
VI Curve (Vin=230Vac/50Hz)
5.5 5
4.5 4
3.5 3
2.5 2
1.5 1
0.5 0
0 0.2 0.4 0.6 0.8 1 1.2 1.4
IOUT (A)wenku.baidu.com
1
21
FR1 Fuse Resistor 10R/1W 10%
1
22
T1
Transformer EE13-V Lp=1.6mH
1
23
Total
25
-7-
7.Transformer drawing
-8-
8. Efficiency
Regulation, Ripple and Efficiency Measurement * Note: Output voltage is measured at the end of PCB
1. Introduction………………………………………………………......................................2 2. Design Features………………………………………….................................................3 3. Power Supply Design Specification…………………………………………………4 4. Schematic……………………………………………………………………………………...5 5. PCB Layout…………………………………………………………………………………....6 6. Bill of Materials………………………………………………….......................................7 7. Transformer Drawing………………………………………...………………………......8 8. Efficiency……………………………………………………..…….......................................9 9. CV and CC Regulation………….…………………………...........................................10 10. Output Ripple Voltage………………………………………………………………….11 11. Turn-on Delay Time ……………..……………………………………………………..12 12. Output Rise Time….……………………………………………………………………..13 13. Dynamic Load Response ……………………………………………………………..14 14. MoU ……………………………………………………………………………………….......15 15. Common Mode Noise …………………………………………………………………..16 16. Vce Waveform………………………………………..……………………………………17 17. Thermal Test………………………… .…………………………………………………...18 18. Conducted EMI …….……………………………………………………………………..19 19. Radiated EMI ………………………………………………………………………….......20
2
2
C3
E-Capacitor 2.2uF/50V 4*7 105℃ ±20%
1
3
C4
SMD Capacitor 0805 470pF/250V 105℃ ±20% X7R 1
4
C5
SMD Capacitor 0603 18nF/50V 105℃ ±20% X7R
1
5
C6
Solid Capacitor 470uF/6.3V 6.5*8 105℃ ±20%
20MHz Bandwidth
W
/
A
Auto-restart
Measured at end of USB %
Vin=115Vac&230Vac Measured at end of USB %
Vin=115Vac&230Vac
S
Full load
mS
Full load
/
/
KV
/
℃
Free convection,sea level