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参数资料
| 型号： | TSI206 |
| 厂商： | INTEGRATED DEVICE TECHNOLOGY INC |
| 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： | 10/28页 |
| 文件大小： | 286K |
| 代理商： | TSI206 |
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Tsi206 Primary Side Monitor with Inrush Control
Datasheet
- 18 -
Tundra Semiconductor Corporation
80C7000_MA001_01 April 2006
system supply voltages (typically -36V to -75 V for
a -48 V system). A capacitor (C1 in Figure 1)
provides filtering of the voltage at VDD.
Resistor Rd must provide the Tsi206 and any other
items powered from VDD (such as the optocoupler
OP1)
with
sufficient
operating
current
under
minimum supply voltage conditions. The value of
Rd must not allow the maximum shunt regulator
current to be exceeded under maximum supply
voltage conditions.
The required resistor value is calculated from:
Rd = (Vsmin - VDDmax) / (IDDmax+Iload)
where Vsmin is the lowest operating input voltage,
VDDmax is the upper limit of the Tsi206 supply
voltage (3.4 V), IDDmax is the maximum current
required for the Tsi206 to operate (4 mA), and Iload
is any additional load current from the 3.3V outputs
of Tsi206 and between VDD and VSS.
The minimum wattage required for Rd is:
P = (Vsmax - VDDmin)
2/Rd
where VDDmin is the lower limit of the Tsi206 supply
voltage (3.2 V) and Vsmax is the highest operating
input voltage.
As an example, assume the input voltage ranges
from 36 V to 72 V, and the total current is 5 mA
(4 mA for the Tsi206 plus 1 mA for the optocoupler).
The highest value resistor that can be used for Rd
is as follows:
Rd (max) = (36 V - 3.4 V)/5 mA = 6.52 k
Ω.
The
closest
standard
value
is
6.2 k
Ω. The
maximum power dissipation in this example is
calculated as:
P (max) = (72 V - 3.2 V)2/6.2 = 763 mW.
A rating of 1 W is therefore required.
In applications where the input voltage may swing
over a very wide range the maximum current may
be exceeded. Consult Tundra for information on
other powering options.
Inrush limit components
The inrush limit circuit design follows a step-by-step
procedure:
Determine the maximum continuous current
Choose the current shunt and the amplifier gain
Select the inrush limit MOSFET
Choose divider resistors for FETA pin
Maximum continuous current
Calculate the maximum continuous input current
during normal operation, which occurs at the
minimum input voltage. Using the Tsi206, the
minimum input voltage is equal to the UV shutdown
setpoint determined by R3 and R9 (refer to UV
For example, if the maximum card power is 450 W
and the UV shutdown point is set to 37 V, the
maximum input current is 12.2 A. Inrush current
limit (and OC threshold) can therefore be set to
approximately 15 A.
Current shunt and amplifier gain
The internal current amplifier has up to 2 mV offset
voltage (refer to Table 3 on page 3). If a very low
value current shunt is used, the offset can result in
a significant error. A higher value current shunt
reduces the error, but has a higher power loss.
For example, if a 2 m
Ω current shunt is used for the
same 450 W example, the sense voltage at the OC
threshold is 30 mV. At the maximum input current,
the sense voltage will be (12.2 × 2) = 24.4 mV. At
nominal input voltage of 50 V the maximum current
is reduced to 9 A (450 W / 50 V), and the current
sense voltage will be (9 × 2) = 18 mV. With this
shunt, the I2R power loss is only 300 mW maximum
at full load (12.2 A), or 450 mW at current limit.
However, the error due to offset can be up to 11%
at full load (2 mV in 18 mV), with some additional
error due to tolerance of the gain setting resistors.
The inrush current (and OC threshold) setpoint
accuracy will be approximately 15 ±1.2 A.
If this accuracy is acceptable and the 2 m
Ω shunt is
used, the amplifier gain is set to increase the sense
voltage from 30 mV to 2.4 V at 15 A, since the OC
detection threshold is 2.4 V (refer to Table 3 on
page 3).
Required gain = 2.4 / 0.03 = 80
Amplifier gain = 1 + R15/R12
If R15 = 47.5 k
Ω, the value for R12 = 601 Ω. The
closest standard value is 604
Ω.
If the accuracy is not acceptable, a higher value
current shunt can be used. For example, if the shunt
is 10 m
Ω, the current sense signal is increased to
150 mV at 15 A. The error due to offset is now only
2.2% at 9 A and the inrush current setpoint
accuracy is approximately 15 ±0.4 A. The amplifier
gain is again set to give 2.4 V at 15 A:
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