http://www.ti.com/tool/pmp4378
PMP4378是使用ti二次侧同步整流芯片ucc24610、原边控制芯片ucc28713设计的反激式变换器。具有独立的原边控制和副边同步整流结构，可实现精确地恒流、恒压输出，空载功耗小于30mW,达到了六星级电源标准.原边反馈控制消除了光藕,减少了器件数量和成本，体积只有37mmx31mmx15mm。另外，还有掉电保护、输出过压、过流保护、过温保护等功能，并做了电缆0.3V压降补偿;该设计方案通过了传导和辐射测试,并且通过了常温以及高温测试。这些特点使其非常适合应用于手机充电器、适配器及其它小功率应用场合。
下图是PMP4378的样板图
PMP4378的结构图如下：
可以看到方案的二次侧，将整流二极管换做了同步整流芯片ucc24610控制的开关管，极大减少了整流管的损耗，，而且24610采用睡眠、UVLO、工作、轻载多种模式，进一步降低轻载、空载功率，提高了电源效率，也方便了系统的热管理。
下面是PMP4378的主要规格及测试结果：
规格：
|
No. |
Description |
Symbol |
Min |
Type |
Max |
Unit |
Test condition |
|
1 |
Rated Input Voltage |
Vin |
100 |
--- |
240 |
Vac |
|
|
2 |
Input Voltage Range |
Vin(min/max) |
85 |
264 |
Vac |
||
|
3 |
Input Current |
Irms |
0.4 |
A |
|||
|
4 |
Rated Input Frequency |
fin |
50 |
60 |
Hz |
||
|
5 |
Input Frequency Range |
Fin(min/max) |
47 |
63 |
Hz |
||
|
6 |
Inrush Current |
Irush |
4 |
A |
264V and 2.4A load |
||
|
7 |
Average Efficiency |
η |
80.3 |
% |
Tested at cable end |
||
|
8 |
Standby Power |
Pst |
30 |
mW |
85Vac-264Vac |
||
|
9 |
Output Voltage |
Vout |
5 |
5.5 |
V |
0-2.4A load and 85V-264Vac |
|
|
10 |
Output Current |
Iout |
2.4 |
A |
85Vac-264Vac |
||
|
11 |
Rated Output Power |
Pout |
12 |
W |
|||
|
12 |
Ripple and Noise |
Vripple |
80 |
mVp_p |
115Vac-230Vac and 0-2.4A |
||
|
13 |
Startup Time |
Stime |
500 |
mS |
115Vac and 2.4A |
||
|
14 |
Over Shoot |
Vover |
1 |
% |
|||
|
15 |
Dynamic response |
4.5 |
V |
0.12A-2.28A, 0.1A/us,30ms cycle |
空载功耗：
效率曲线：
负载效率曲线：
USB端的IV曲线：
热试验（环境温度45◦C）：
| Temp record | ||||||
| 90VAC 50Hz ,Ambient:45℃ | 264VAC 60Hz,Ambient:45℃ | |||||
| Thermal Coupler Channel |
Name | Pos | Record Time | CV5V | Record Time | CV5V |
| 14:00~15:00 | 2.4A | 16:10~17:10 | 2.4A | |||
| 11 | Input cap | C1 | 67.5ºC | 63.2ºC | ||
| 15 | Input cap | C2 | 71ºC | 66.3ºC | ||
| 3 | Input inductor | L1 | 71.9ºC | 63.5ºC | ||
| 8 | Schonounous MOSFET | Q2 | 68.4ºC | 68ºC | ||
| 9 | Transformer | T1 Core | 79.4ºC | 76.7ºC | ||
| 1 | Transformer | T1 Winding | 85.1ºC | 77ºC | ||
| 17 | Power Switch | Q1 | 73ºC | 73ºC | ||
| 5 | Output cap | C5 | 63.9ºC | 63.7ºC | ||
| 7 | Output cap | C3 | 67.8ºC | 67.2ºC | ||
| 13 | Output rectifier | D2 | 66.4ºC | 66.2ºC | ||
| 16 | Rect. Bridge diode | DB1 | 73.1ºC | 64.9ºC | ||
| 10 | UCC28713 | U1 | 71.9ºC | 70.2ºC | ||
| 4 | UCC24610 | U2 | 64.7ºC | 64.3ºC | ||
| actual Ta | Ta=45.5ºC | Ta=46.8ºC | ||||
EMI测试：
1.5m cable with 2R resistor Io=2.4A, 230V, Line
1.5m cable with 2R resistor Io=2.4A, 230V, Neutral
EMI辐射测试：
1.5m cable with 2R resistor Io=2.4A, 230V, HORIZONTAL
1.5m cable with 2R resistor Io=2.4A, 230V, VERTICAL
保护测试
|
No |
Item |
Test result |
|
1 |
Input UVP |
Start at 77Vac, Stop at 72Vac |
|
2 |
Output over current protection |
Ok, 2.55A maximum |
|
3 |
Output short-circuit protection |
Ok, hiccup mode |
|
4 |
Output over voltage protection |
Ok, 5.75V maximum |
|
5 |
Over Temperature protection |
OK |
