VI-HAM-MM Vicor Corporation, VI-HAM-MM Datasheet - Page 7

• Manufacturer Part Number: VI-HAM-MM
• Manufacturer: Vicor Corporation

PIN FUNCTION / DESCRIPTION (CONT.)
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P/OK
Power OK is a monitor signal that indicates the status of the
AC mains and the DC output voltage of the HAM. P/OK is
asserted (active low) when the output bus voltage is within
normal operating range 20 – 25 ms after DC-DC converters are
enabled by the E/O signal of the HAM. This provides sufficient
time for the converters to turn on and their output(s) to stabilize
prior to P/OK being asserted, Figure 9. For momentary
interruptions of AC power, the HAM will provide at least 16
ms of ride through or hold up time (with 1,000 µF output
capacitor). On loss of power or brownout, (when the HAM
Figure 7
Figure 8
LOGIC
LOGIC
G
G
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D
S
D
S
+OUT
–OUT
P/OK
+OUT
–OUT
P/OK
E/O
A/S
E/O
A/S
HAM, Harmonic Attenuation Module
output voltage drops below 230 Vdc) the P/OK signal will go
to an open circuit state, see Figure 7, signaling an impending
loss of input power to the converter modules. P/OK will
provide power fail warning at least 1 ms prior to converter shut
down. When the HAM output voltage drops below 195 Vdc the
converters are disabled via Enable Output (E/O).
Figure 9
DC-DC Converter(s)
Enable Output (E/O)
Power OK (P/OK)
DC Output
AC Mains
120 Vrms
Outputs
of HAM
240 Vdc
Rectified Line
Boost Voltage
10 ms
25 ms
Rev. 2.0
Off at 195 Vdc
Off below 195 Vdc
230 Vdc
195 Vdc
Off at 230 Vdc
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