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參數(shù)資料
| 型號： | TPS2490DGSG4 |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 電源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO10 |
| 封裝： | GREEN, PLASTIC, MSOP-10 |
| 文件頁數(shù)： | 6/24頁 |
| 文件大小： | 534K |
| 代理商： | TPS2490DGSG4 |
GATE10V/div
OUT10V/div
TIMER1V/div
IIN
.5A/div
t-Time-200ms/div
R
S +
0.05
1.2
I
MAX
SLVS503C
– NOVEMBER 2003 – REVISED SEPTEMBER 2011
Automatic Restart (Figure 17)
The TPS2491 automatically initiates a restart after a fault has caused it to turn off M1. Internal control circuits use
CT to count 16 cycles before re-enabling M1. This sequence repeats if the fault persists. The TIMER has a 1:10
charge-to-discharge current ratio, and uses a 1-V lower threshold. The fault-retry duty cycle specification
quantifies this behavior. This small duty cycle often reduces the average short-circuit power dissipation to levels
associated with normal operation and eliminates special thermal considerations for surviving a prolonged output
short.
Figure 17. TPS2491 Restart Cycle Timing
DESIGN PROCEDURE
This design procedure seeks to control the junction temperature of M1 under both static and transient conditions
by selecting the device
’s package, cooling, RDS(on), current limit, fault timeout, and power limit. The following
procedure assumes that a unit running at full load and maximum ambient temperature experiences a brief input
power interruption sufficient to discharge CO, but short enough to keep M1 from cooling. A full CO recharge then
takes place. Adjust this procedure to fit your application and design criteria. See SLVC033 for a calculation tool
to help with this process.
This procedure assumes that CO is the only load during inrush. Only simple first-order thermal models, natural
convection and a large PCB pad for M1 are assumed. The assumptions build generous safety margins into the
design to allow for the inherent inaccuracies of the models and variations of real-world conditions.
Other tools and applications information are available on the TI website that supplement the following procedure.
STEP 1. Choose RS
Given the maximum operating current, IMAX, compute the current sense resistance, RS.
(4)
This equation allows for minimum current limit, a sense resistor tolerance of 5%, and 5% margin. Round the
result down to the nearest available standard value.
STEP 2. Choose M1
First select a VDS rating that allows for the maximum input voltage and transients. Next select an operating
RDS(on), package, and cooling to control operating temperature. The following equation computes the value of
RDS(on)(MAX)at a junction temperature of TJ(MAX). Most manufacturers list RDS(on)(MAX) at 25°C and provide a
derating curve from which values at other temperatures can be derived. Compute the maximum allowable
on-resistance, RDS(on)(MAX), using the equation:
14
Copyright
2003–2011, Texas Instruments Incorporated
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