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| 型號： | UCC2919DTR |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 電源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO16 |
| 封裝： | GREEN, PLASTIC, MS-012AC, SOIC-16 |
| 文件頁數(shù)： | 3/27頁 |
| 文件大?。?/td> | 701K |
| 代理商： | UCC2919DTR |
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UCC2919
UCC3919
SLUS374C JULY 1999 REVISED NOVEMBER 2005
11
www.ti.com
APPLICATION INFORMATION
estimating CT(min) when using power limiting
If power limiting is used, the calculation of CT(min) for a given COUT becomes considerably more complex,
especially with a resistive load. This is because the CT charge current becomes a function of VOUT, which is
changing with time. The amount of capacitance that can be charged (without causing a fault) when using power
limiting will be significantly reduced for the same value CT, due to the shorter tON time.
The charge current contribution from the power limiting circuit is defined as:
I
PL ^
V
IN *
V
OUT *
V
PL
R
PL
t0: Normal condition Output current is nominal, output voltage is at positive rail, VCC.
t1: Fault control reached Output current rises above the programmed fault value, CT begins to charge with 35 A + IPL.
t2: Maximum current reached Output current reaches the programmed maximum level and becomes a constant current with value IMAX.
t3: Fault occurs CT has charged to 1.5 V, fault output goes low, the FET turns off allowing no output current to flow, VOUT discharges to GND.
t4: Retry CT has discharged to 0.5 V, but fault current is still exceeded, CT begins charging again, FET is on, VOUT increases.
t3 to t5: Illustrates < 3% duty cycle depending upon RPL selected.
t6 = t4
t7: Fault released, normal condition return to normal operation of the circuit breaker
UDG97073
Figure 3.
(14)
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