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參數(shù)資料
| 型號： | TPS2490DGSR |
| 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)： | 3/24頁 |
| 文件大小： | 534K |
| 代理商： | TPS2490DGSR |
VCCCH1
VCC10V/div
Timer1V/div
IIN 1A/div
PG
10V/div
OUT
10 V/div
t-Time-2ms/div
SLVS503C
– NOVEMBER 2003 – REVISED SEPTEMBER 2011
APPLICATION INFORMATION
BASIC OPERATION
The TPS2490/91 provides all the features needed for a positive hotswap controller. These features include: 1)
under-voltage lockout; 2) adjustable (system-level) enable; 3) turn-on inrush limit; 4) high-side gate drive for an
external N-channel MOSFET; 5) MOSFET protection (power limit and current limit); 6) adjustable overload
timeout
—also called an electronic circuit breaker; 7) charge-complete indicator for downstream converter
coordination; and 8) an optional automatic restart mode. The TPS2490/91 features superior power-limiting
MOSFET protection that allows independent control of current limit (to set maximum full-load current), power limit
(to control junction temperature rise), and overload time (to control case temperature rise).
The typical application circuit, and oscilloscope plots of Figure 13 through Figure 17 demonstrate many of the
functions described above.
Board Plug-In (Figure 13)
Only the bypass capacitor charge current and small bias currents are evident when a board is first plugged in.
The TPS2490/91 is held inactive, and GATE, PROG, TIMER, and PG are held low for less than 1 ms while
internal voltages stabilize. A startup cycle is ready to take place after the stabilization.
GATE, PROG, TIMER, and PG are released after stabilization in this example because both the internal UVLO
threshold and the external EN (enable) thresholds have been exceeded. The part begins sourcing current from
the GATE pin and M1 begins to turn on while the voltage across it, V(SENSE–OUT), and current through it,
V(VCC–SENSE), are monitored. Current initially rises to the value which satisfies the power limit engine (PLIM ÷ VVCC)
since the output capacitor was discharged.
TIMER and PG Operation (Figure 13)
The TIMER pin charges CT as long as limiting action continues, and discharges at a 1/10 charge rate when
limiting stops. If the voltage on CT reaches 4 V before the output is charged, M1 is turned off and either a
latch-off or restart cycle commences, depending on the part type. The open-drain PG output provides a
deglitched end-of-charge indication which is based on the voltage across M1. PG is useful for preventing a
downstream dc/dc converter from starting while CO is still charging. PG goes active (open drain) about 9 ms after
CO is charged. This delay allows M1 to fully turn on and any transients in the power circuits to end before the
converter starts up. The resistor pull-up shown on pin PG in the typical application diagram only demonstrates
operation; the actual connection to the converter depends on the application. Timing can appear to terminate
early in some designs if operation transitions out of the power limit mode into a gate charge limited mode at low
VDS values.
Figure 13. Basic Board Insertion
Copyright
2003–2011, Texas Instruments Incorporated
11
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| TPS2491DGSR | 功能描述:熱插拔功率分布 Retry Pos Hi-Voltage Pwr-Limiting RoHS:否 制造商:Texas Instruments 產(chǎn)品:Controllers & Switches 電流限制: 電源電壓-最大:7 V 電源電壓-最小:- 0.3 V 工作溫度范圍: 功率耗散: 安裝風格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Tube |
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