參數(shù)資料
型號(hào)： 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)： 6/27頁
文件大?。?/td> 701K
代理商： UCC2919DTR
UCC2919
UCC3919
SLUS374C JULY 1999 REVISED NOVEMBER 2005
14
www.ti.com
APPLICATION INFORMATION
example
The example in Figure 5 shows the UCC3919 in a typical application. A low value sense resistor and N-channel
MOSFET minimize losses. With the values shown for R1, R2, and RS, the overcurrent fault will be 5-A nominal.
Linear current limiting (IMAX) will occur at 7.14 A and the overload comparator will trip at 27 A. The calculations
are shown below.
I
FAULT +
0.05
R
S
+ 0.05
0.01
+ 5A
I
MAX +
V
CSP *
V
IMAX
R
S
+
1.5
R1
(R1
) R2)
R
S
+ 7.14 A
I
OVERLOAD +
I
MAX )
0.2
R
S
+ 7.14 A ) 0.2
0.01
+ 27.14 A
T
OFF(sec) +
C
Tm
F
1.2
+ 0.01
1.2
+ 8.33 ms
With the value shown for RPL:
I
PL(typ)
(output shorted)
+
V
IN *
V
PL
R
PL
+ 5 * 1.6
10 k
+ 340 mA
t
ON
(shorted)
+
C
T
I
PL )
35
106
+ 0.01
106
375
mA
+ 27 ms
P
DISS
(shorted)
+
I
MAX
V
IN
t
ON
t
ON )
t
OFF
+
7.14
5
27
ms
27
ms ) 8.33
103
+ 0.12 W
For a worst case 1
resistive load: COUT(max) 47 F.
For a worst case 5 A constant current load: COUT(max) 27 F.
With L/R grounded, the part will operate in the retry or hiccup mode. The values shown for CT and RPL will yield
a nominal duty cycle of 0.32% and an off time of 8.3 ms. With a shorted output, the average steady state power
dissipation in Q1 will be less than 100 mW over the full input voltage range.
If power limiting is disabled by opening RPL, then:
t
FAULT +
t
ON(sec) +
C
Tm
F
1
35
+ 287 ms
P
DISS
(shorted)
+
I
MAX
V
IN
t
ON
t
ON )
t
OFF
+ 7.14
5
287
106
287
106
) 8.33
103
+ 1.2 W (withV
IN +
5V)
For a worst case 1-
resistive load: COUT(max) 220 F.
For a worst case 5 A constant current load: COUT(max) 120 F.
(22)
(23)
(24)
(25)
(26)
(27)
(28)
(29)
(30)
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