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參數資料
| 型號： | 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： | 10/29頁 |
| 文件大?。?/td> | 427K |
| 代理商： | TPS2306DWG4 |
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TPS2306
DUAL SEQUENCING HOT SWAP POWER MANAGER
SLVS368 APRIL 2001
18
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
IMAXx
(min) ^
R
IMAXx
(0.9)
I
SINK(min) *
V
OS
R
SNSx
IMAXx
(min) ^
R
IMAXx
I
REF(min) *
V
OS
R
SNSx
where:
IMAXx
(min) = the minimum constant-current level
V
OS = the maximum input offset of the linear current amplifier, ±4 mV
I
REF(min) = the minimum reference current value, determined from IREF(min) = 1.4 V/RREF
Substituting the device and design example values into equation 6, the values of IMAX1(min) = 0.75 A and
IMAX2(min) = 2.16 A are obtained, which should provide sufficient margin above the nominal 0.5-A and 1.5-A
loads.
Note that in equations 5 and 6 the tolerances of external resistors are ignored; the user can include these if
desired.
circuit breaker trip points
At this point in the design process, sufficient information is known to calculate the circuit breaker trip thresholds.
Referring to the typical application diagram, the current-sense measurement is applied to the inverting input of
the OVLD comparator. It can also be seen from the diagram that the reference voltage for comparison is
developed by sourcing IREF through programming resistor RIMAX and the internal resistor R1 (for channel 1).
Therefore, the nominal trip current threshold, IFLT, can be calculated from equation 7.
I
FLTx +
R
IMAXx )
R
INT
(1.1)
I
REF
R
SNSx
+
R
IMAXx )
2500
W
(1.1)
I
REF
R
SNSx
If the resultant circuit-breaker thresholds are determined to be too high, they can be adjusted by a combination
of decreasing the reference current and/or increasing the sense resistor value.
soft-starting the TPS2306
Inrush current slew rate control, or soft-start, can be programmed into the TPS2306 operation by adding a
capacitor in parallel with the IMAX resistor, as shown by CSS1 and CSS2 in the Figure 2 schematic. When the
output ramp-up is enabled, the IMAXx pin voltage ramps with an RC characteristic. Accordingly, the current
supplied during output charging (after the initial slow turn-on period) is of the form:
I
SRC
(t)
+ IMAX
1
* e
*t
R
IMAX
C
SS
where IMAX is the steady-state constant-current level set by RIMAX if soft-start were not employed, and (from
equation 4) is given by equation 9.
IMAX
+
R
IMAX
(1.1)
I
REF
R
SNS
(5)
(6)
(7)
(8)
(9)
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