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参数资料
| 型号： | Q2D30ZEY-8 |
| 厂商： | POWER-ONE INC |
| 元件分类： | 电源模块 |
| 英文描述： | 2-OUTPUT DC-DC REG PWR SUPPLY MODULE |
| 文件页数： | 10/14页 |
| 文件大小： | 248K |
| 代理商： | Q2D30ZEY-8 |
Q2D Series – Quarter-Brick DC/DC Converter
48V Input
Data Sheet
Dual Output
Rev. NOV 13, 2002
Page 5 of 14
Start-up Information (using negative ON/OFF)
Scenario #1: Initial Start-up From Bulk Supply
ON/OFF
function
enabled,
converter
started
via
application of VIN. See Figure 1.
Time
Comments
t0
ON/OFF pin is ON; system front end power
is toggled on, VIN to converter begins to rise.
t1
VIN
crosses
Under-Voltage
Lockout
protection
circuit
threshold;
converter
enabled.
t2
Converter begins to respond to turn-on
command (converter turn-on delay).
t3
Output voltage VOUT1 reaches 100% of
nominal value.
t4
Output voltage VOUT2 reaches 100% of
nom inal value.
For this example, the total converter start-up time (t4- t1)
is typically 3ms.
Scenario #2: Initial Start-up Using ON/OFF Pin
With VIN previously powered, converter started via
ON/OFF pin. See Figure 2.
Time
Comments
t0
VINPUT at nominal value.
t1
Arbitrary time when ON/OFF pin is enabled
(converter enabled).
t2
End of converter turn-on delay.
t3
Output voltage VOUT1 reaches 100% of
nominal value.
t4
Output voltage VOUT2 reaches 100% of
nominal value.
For this example, the total converter start-up time (t4 -
t1) is typically 3ms.
Scenario #3: Turn-off and Restart Using ON/OFF
Pin
With VIN previously powered, converter is disabled and
then enabled via ON/OFF pin. See Figure 3.
Time
Comments
t0
VIN and VOUT are at nominal values; ON/OFF
pin ON.
t1
ON/OFF pin arbitrarily disabled; converter
outputs fall to zero; turn-on inhibit delay
period
(100ms typical) 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 action is
internally enabled.
t3
Turn-on inhibit delay period ends. If ON/OFF
pin is ON, converter begins turn-on; if off,
converter awaits ON/OFF pin ON signal; see
Figure 6.
t4
End of converter turn-on delay.
t5
Output voltage VOUT1 reaches 100% of
nominal value.
t6
Output voltage VOUT2 reaches 100% of
nominal value.
For the condition, (t2 - t1) = 100ms, the total converter
start-up time (t6 - t2) is typically 103ms. For (t2 - t1) > 100
ms, start-up time will be typically 3ms after release of
ON/OFF pin.
VOUT 1
t4
VOUT 1
VOUT 2
VIN
ON/OFF
STATE
VOUT 2
t 0
t1 t2
t3
ON
OFF
Fig. 1. Start-up Scenario #1
VOUT1
VOUT2
VOUT1
VOUT2
t4
t 3
ON/OFF
STATE
t0
t 1 t2
ON
OFF
VIN
Fig. 2. Start-up Scenario #2
t6
VOUT1
VOUT2
VOUT1
ON/OFF
STATE OFF
ON
t0
t2
t1
t5
VIN
t4
t3
100 ms
Fig. 3. Start-up Scenario #3
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