RM23712 TPS
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4. keep all fans rolling
5. LED is green blinking
3.5.2.1 Powering on Smart Standby supplies to maintain best efficiency
Power supplies in Smart Standby state shall monitor the shared voltage level of the load share
signal to sense when it needs to power on. Depending upon which position the system defines that
power supply to be in the Smart Standby configuration; will slightly change the load share threshold
that the power supply shall power on at.
3.5.2.2 Powering on Smart Standby supplies during a fault or over current
condition
Some warnings happen or 12V output shutdown due to any fault. When an active power supply
asserts, all parallel power supplies in Smart Standby mode shall power on immediately.
The trigger condition:
1. 12V OC fault happens
2. 12V OVP fault
3. 12V UVP fault
4. OTP warning/ fault
5. fan speed fault
6. AC loss(low than 75V +/-5V)
When an active power supply asserts, all parallel power supplies in Smart Standby mode shall
power on immediately.
3.5.3 The Way to Enable Smart On Function
Here are the steps to put PSU into smart on mode. PSU which is assigned as smart on standby can
operate in a power-off state and turn on main power if necessary.
The trigger levels above may have a +/-10% tolerance for actual application.
Step1: Make sure every PSU has AC power cord applied. Use write byte command to set command
0xD0 for each PSU to has it own role (must one PSU as active role).
The command format for Smart On function will be as following example.
B0 in smart_on_active (S B0 w D0 01 PEC P)
B2 in smart_on_standby (S B2 w D0 02 PEC P)
Step2: PSU will enter smart slave mode once the load is lower than the corresponding trigger point.
Step3: If SMART_ON signal falls to low, all PSU will turn on the main power and reset smart_config
to 0x00 (standard redundancy). System needs to re-assign the roles for all PSU to enable smart on
function again.
3.6 ENVIRONMENTAL
The power supply shall operate normally, and sustain no damage as a result of the environmental
conditions listed in this chapter.
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