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參數(shù)資料
| 型號(hào)： | TPS2306DWG4 |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 電源管理 |
| 英文描述： | 2-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO16 |
| 封裝： | SOIC-16 |
| 文件頁數(shù)： | 9/29頁 |
| 文件大小： | 427K |
| 代理商： | TPS2306DWG4 |
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TPS2306
DUAL SEQUENCING HOT SWAP POWER MANAGER
SLVS368 APRIL 2001
17
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
setting the reference current magnitude
The reference current level is established by connecting a resistor between the TPS2306 IREF pin and ground
(RREF in Figure 2). The IMAXx sink currents used to develop the constant-current thresholds are determined
by this reference current value. The TPS2306 can be configured to source from approximately 35
A to 300 A.
At 100
A or greater, the variation in sink currents at the IMAXx inputs is typically ±10% of the programmed
value; however, variation increases with reference current decreasing below the 100-
A level. In addition, the
circuit breaker trip threshold is also established as a resistor drop below the LCA reference (see R1 and R2 in
functional block diagram). It is also then a function of the reference current. Therefore, constant-current mode
accuracy must be balanced against the circuit breaker trip threshold when establishing design values. For a
given sense resistor value, higher values of reference current result in higher overload current thresholds. The
circuit breaker setting can be adjusted downward by decreasing the reference current, or returning to the
previous step and increasing the value of the sense resistor.
For the Figure 2 application, the reference current was set to 100
A to maintain current source accuracy. The
programming resistor value is then determined from:
R
REF +
V
REF
I
REF
+ 1.5 V
I
REF
where:
V
REF = the IREF pin output voltage
I
REF = the desired reference current
For IREF = 100 A, the resistor RREF was set to the standard 1% value of 15.0 k.
determining the IMAX programming resistor values
During a start-up sequence, the internal LCAs slew the GATEx outputs to maintain the voltage at the CSx pins
equal to the voltage at the corresponding IMAXx input. Therefore, the voltage across the sense resistor RSNSx
is equal to the drop across the IMAXx programming resistor. Since the sense voltage is the I-R drop of the load
current, the RIMAXx resistors can be calculated from:
R
IMAXx +
IMAXx
R
SNSx
(1.1)
I
REF
where:
IMAXx = the desired constant-current sourcing level
Substituting values from the example application, the following resistor values were calculated.
R
IMAX1 +
(1.0 A)
(0.04
W)
(1.1
100
mA)
^ 364 W and R
IMAX2 +
(3.0 A)
(0.01
W)
(1.1
100
mA)
^ 273 W
The standard 1% values of RIMAX1 = 365 and RIMAX2 = 274 were selected.
Again, the constant current levels must be above the nominal operating current of the load electronics for proper
operation of the hot swap circuit. Once the sense resistor and IMAX resistor values have been established, this
guideline can be verified by testing for the minimum value of the constant-current level, or IMAXx(min). The two
main contributors to device-to-device IMAX variance are the tolerance of the IREF output voltage, and that of
the current sinks at the IMAXx inputs. Assuming the 10% tolerance on IMAX described in the Setting the
Reference Current Magnitude section, the minimum sourcing current during linear operation can be estimated
from equation 5 or 6.
(3)
(4)
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