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参数资料
| 型号： | TSI206 |
| 元件分类： | 电源管理 |
| 英文描述： | POWER SUPPLY MANAGEMENT CKT, PQFP32 |
| 封装： | LQFP-32 |
| 文件页数： | 7/28页 |
| 文件大小： | 286K |
| 代理商： | TSI206 |
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Datasheet
Tsi206 Primary Side Monitor with Inrush Control
80C7000_MA001_01 April 2006
Tundra Semiconductor Corporation
- 15 -
Secondary side shutdown
The Tsi206 can be used to shut down the brick in
response to a Shutdown signal from the companion
secondary
side
controller.
This
allows
the
secondary side controller to shut down the
intermediate bus if it detects an unrecoverable fault
in the secondary power converters. For example, if
a point-of-load power converter fails it may not
respond to a shutdown signal at its own enable pin.
The Shutdown signal connects to the BUSOFF pin
of the Tsi206 through an optocoupler. This pin has
an internal debounce timer to prevent spurious
events causing a false shutdown - refer to Table 6.
This pin is active high to disable the brick. When the
optocoupler is on the brick is enabled, which
ensures that a failed optocoupler does not cause an
undetected fault. A one second mask is applied to
this signal on power up, since the optocoupler is not
active at that time.
Tsi206 power feed
The Tsi206 is designed to power itself from the
primary voltage (usually 24 V or 48 V nominal),
using an external resistor and an internal shunt
regulator. Operating voltage is 3.3 V. Since the
maximum current is 5 mA (including 1 mA for the
optocoupler OP1 — refer to Figure 1 on page 1),
the external resistor must be rated at 1 W for a
supply voltage range from 36 V to 75 V.
Brick enable drive
The Tsi206 monitors the gate-to-source voltage of
the inrush FET through the FETA pin (via resistor
divider R13, R14) to determine when the inrush is
complete.
The brick is turned on if all of the following are true:
SEAT pin is valid
Input voltage is above VUVH
Inrush is complete (FETA pin is >1.25 V)
The brick is turned off if any of the following are true:
SEAT pin is invalid
Input voltage is below VUVL
BUSOFF pin is high (after startup mask expires)
Inrush is not complete (FETA pin is <1.25 V)
Glitch filters are used on all these signals to avoid
any possibility of unwanted nuisance shutdown. For
details, refer to Table 6, and to Table 4 on page 7.
Auxiliary voltage measurement
The Tsi206 can measure an additional primary side
voltage using the AUX pin. The voltage at this pin is
converted into a 10-bit value and stored in a register
for transmission to the secondary side through the
PI-Link. The voltage at the AUX pin also feeds a
comparator with a reference of 1.25 V.
The AUX pin is intended as a general purpose
input. It can be used to monitor any primary side
signal, such as fan speed.
Decoupling capacitors
Decoupling
capacitors
(1000 pF)
are
recommended on the following pins: UV, VBATT,
FUSE_H, FUSE_L, and AUX.
Glitch filters
Glitch filters (digital delays) are applied to the logic
signals in the Tsi206, to prevent incorrect operation
due to short transient spikes or other momentary
events. The values of these filters are shown in
Note: The UV detection filter is much shorter than
the other filters. If -48 V power to the card is
removed suddenly, the input capacitance (C4 in
Figure 1 on page 1) immediately starts to discharge
due to the load current drawn by the brick. The UV
detection time is deliberately set to be very short
(200
μs) to ensure that the Tsi206 correctly detects
a UV condition before the voltage drops to the
internal shutdown threshold of the brick. Refer to
Using a Tundra Primary Side Monitor for more
information.
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