150W 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 |
¡æ |
-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¦ÌF tantalum capacitor and 0.1¦ÌF 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. |
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