200W DC/DC POWER SUPPLY FOR CARPC
1 Function Description
DC/DC ATX power supply for automobile application, 6-32VDC input, +5V,+12V,+3.3V,-12V,+5VSB and PG (power good signal) outputs.
|
Item |
Unit |
Minimum |
Typical |
Maximum |
Test Conditon |
|
Temperature |
?äðDIV> |
-20 |
|
50 |
|
|
RH |
%RH |
40 |
|
90 |
No Condensation |
3.1 Input Characteristic
|
Item |
Unit |
Minimum |
Typical |
Maximum |
Test Conditon |
|
DC INPUT |
Vdc |
6 |
24 |
32 |
|
|
Input Current |
A |
6 |
|
30 |
|
|
|
3.2 Output Characteristic
|
Output |
Min. Load |
Max. Load |
Peak Load |
Output Voltage range |
Ripple??pk-pk????rated load??20MHz limit??* |
|
+5V |
0.5A |
10A |
|
4.75~5.25V |
50mV |
|
+12V |
0.3A |
6A |
6A |
11.40~12.60V |
120mV |
|
+3.3V |
0.5A |
10A |
|
3.14~3.55V |
50mV |
|
-12V |
0A |
0.2A |
|
-11.0~-13.2V |
120mV |
|
+5VSB |
0.1A |
2A |
3A |
4.75~5.25V |
100mV |
*: Need to add 47?̆ tantalum capacitor and 0.1?̆ high frequency capacitor on test point when testing.
|
Item |
Unit |
Minimum |
Typical |
Maximum |
Test Conditon |
|
Output Power |
W |
|
|
150 |
DC output power |
|
Efficiency |
% |
|
90 |
|
Rated load |
|
|
|
|
|
|
|
|
Turn on Overshoot |
% |
|
|
10 |
|
|
Rise Time |
ms |
|
20 |
|
Output voltage up from 0% to 95%??rated load |
|
Hold up Time |
ms |
|
2 |
|
Rated load |
3.3 EMC Requirement
|
Item |
Request |
Standard |
Judgement Grade |
|
Conducted interference |
CLASS B, 3dB margin |
EN55022 |
Ensure system pass the CLASS B and have 3dB margin |
|
Radiation interference |
CLASS B, 3dB margin |
EN55022 |
Ensure system pass the CLASS B and have 3dB margin |
3.4 Protection Function
|
Item |
Unit |
Yes/No |
Minimum |
Typical |
Maximum |
Recovery Characteristic |
|
Input invertion protection |
|
Yes |
|
|
|
|
|
+5V OVP |
V |
Yes |
5.8 |
|
6.8 |
Latched, need to re-apply DC input to recovery |
|
+12V OVP |
V |
Yes |
13.2 |
|
15.6 |
Latched |
|
+3.3V OVP |
V |
Yes |
3.9 |
|
4.3 |
Latched |
|
Short CircuitProtection??+5V,+12V,+3.3V?? |
|
Yes |
|
|
|
Lached |
4 Monitoring ,Signal Control
4.1 Process Sequence
|
Item |
Name |
Characteristic |
|
1
|
Power good signal
??PG?? |
The PG signal comes from the No. pin8 of the 20pin output connector, it indicate the power supply working condition, this ??TTL?? signal is the result of ??AND?? relationship with DC output and DC input voltage . On working condition, if the DC input voltage is well within it??s operation range, then the PG signal is sent out (PG is in H logic) after 100-500ms delay. If the DC input voltage down and below to 11V, or the one of DC output voltage out of it??s normal range, then send out Power Fall signal (that is: PG is in L logic). The Power Fall signal fall to below 0.3V, should have 1ms (at least) before the +5V output down to 4.5V,. And the PG signal??s slop during the rise up and fall down
Should be smooth and no any oscillation happened. PG signal should have the capacity to drive 6 standard TTL loading.
|
|
2
|
Sleeping mode control
(ON/OFF) |
The ON/OFF signal comes from the No. pin14 of the 20pin output connector, is to control the power supply??s working state. (Be active in ??L?? level). If the ON/OFF signal is in floating, the power supply will have no output (except 5VSB ) and in sleeping mode . The 5VSB should be within the range of 4.75-5.25V under 1.5A loading condition, and no any audible noise can be heard. If the ON/OFF signal is shorted to ground, the power supply will be in normal working condition and have normal output voltage. |  |
