TM
Technical Specification
SQ100-48-3.3,
SQ100-48-3.3N
Data Sheet
SQO100-48-3.3, SQO100-48-3.3N
48Vin 3.3Vout 25A
Start up information
Scenario #1: Initial Start up from power supply
On/Off function enabled, the unit starts via input voltage Vin
See Fig 9.
Time
Comments
t0 On/Off pin is On: system front-end power is switched
on, Vin to unit begins to rise.
t1 Vin crosses Under voltage lockout protection circuit
threshold: the unit enabled to be on
t2 The unit begins to turn on ( unit turn-on delay).
t3
Unit output voltage reaches 100% of normal
voltage.
For this example, the unit total start up time (t3- t1) is
typically 45ms.
Scenario #2: Initial Start up using On/Off Pin
With Vin previously powered, the unit starts via On/Off pin.
See Fig 10.
Fig 9. Start up waveform
Time
t0
Comments
Vin at nominal value.
t1
Arbitrary time when On/Off pin is enabled (Unit
enabled)
t2
t3
End of unit turn-on delay
Unit Vout reaches 100% of nominal voltage.
For this example, the unit total start up time (t3- t1) is
typically 70ms.
Scenario #3: Turn-off and restart using On/Off Pin
With Vin previously powered, the unit is disabled and then
enabled via On/Off pin. See Fig 11.
Time
Comments
t0
Vin and Vout are at nominal values, On/Off pin
On.
Fig 10. Start up using On/Off pin
t1
On/Off pin arbitrarily disabled, the unit output
falls to zero. Turn-on inhibit delay period
(100ms) is initiated, and On/Off pin action is
internally inhibited.
t2
On/Off pin is externally re-enabled.
If (t2- t1) £ 100ms, external action of On/Off pin
Is locked out by start up inhibit timer.
If (t2- t1) > 100ms, On/Off pin is On, the unit
begins turn-on; if off, the unit awaits On/Off pin
On signal; see Fig 11.
t3
Unit Vout reaches 100% of nominal voltage.
For the condition, (t2- t1) £ 100ms, the unit total start
up time (t5- t2) is typically 200ms. For (t2- t1) >
100ms , start up should be typically 45ms after release
of On/Off pin.
Fig 11. Turn off and restart using On/Off pin
Broadband TelCom Power, Inc. 1719 S. Grand Avenue, Santa Ana, CA 92705 U.S.A.
P 11 of 16
Tel.: 714-259-4888 • Fax: 714-259-0840 • www.btcpower.com • Email: sales@btcpower.com • PS SQ100-48-3.3, SQO100-48-3.3 Rev1 4-2-03
BTCPOWER [ BROADBAND TELCOM POWER, INC. ]
