Car PC Car PC Power supply
150W DC/DC POWER SUPPLY FOR CARPC
1 Function Desc ription
DC/DC ATX power supply for automobile application, 6-32VDC input,
+5V,+12V,+3.3V,-12V,+5VSB and PG (power good signal) outputs.
2 Operation Environment
Item Unit Minimum Typical Maximum Test Conditon
Temperature ?DIV> -2050
RH %RH 4090 No Condensation
3 Technique Requirement
3.1 Input Characteristic
Item Unit Minimum Typical Maximum Test Conditon
DC INPUT Vdc 6 24 32
Input Current A 630
3.2 Output Characteristic
3.2.1 Output Voltage Regulation
Output Min. Load Max. Load Peak Load Output Voltage range
Ripple??pk-pk????rated load??20MHz limit??*
+5V 0.5A 10A4.75~5.25V 50mV
+12V 0.3A 6A 6A 11.40~12.60V 120mV
+3.3V 0.5A 10A3.14~3.55V 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.
3.2.2 Others Output Characteristics
Item Unit Minimum Typical Maximum Test Conditon
Output Power W150 DC output power
Efficiency %90Rated load
Turn on Overshoot %10
Rise Time ms20Output voltage up from 0% to 95%??rated load
Hold up Time ms2Rated 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 protectionYes
+5V OVP V Yes 5.86.8 Latched, need to re-apply DC input to recovery
+12V OVP V Yes 13.215.6 Latched
+3.3V OVP V Yes 3.94.3 Latched
Short CircuitProtection??+5V,+12V,+3.3V??YesLached
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.
