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

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

PIN FUNCTION / DESCRIPTION (CONT.)
Figure 7
Figure 8
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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 (>270 Vdc) and 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,
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, High-Boost Harmonic Attenuation Module
(when the HAM output voltage drops below 270 Vdc) the
P/OK signal will go to an open circuit state (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 250 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
280 Vdc
Rectified Line
Boost Voltage
10 ms
25 ms
Rev. 2.3
Off below 250 Vdc
Off at 250 Vdc
270 Vdc
250 Vdc
Off at 270 Vdc
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