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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)： | 26/27頁 |
| 文件大?。?/td> | 701K |
| 代理商： | UCC2919DTR |
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UCC2919
UCC3919
SLUS374C JULY 1999 REVISED NOVEMBER 2005
8
www.ti.com
APPLICATION INFORMATION
Figure 1
0.0
0.25
0.50
0.01
0.1
1
10
100
1000
10,000
0.75
1.00
1.25
1.50
1.75 2.00
SUPPLY CURRENT
vs
SD PIN VOLTAGE
I CC
Supply
Current
A
VSD SD Pin Voltage V
IMAX threshold
The second threshold is programmed by the voltage on IMAX (measured with respect to the CSP pin). This
controls the maximum current, IMAX, that the UCC3919 will allow to flow into the load during the MOSFET on
time. A resistive divider connected between IBIAS and CSP generates the programming voltage. When the drop
across the sense resistor reaches this voltage, a linear amplifier reduces the voltage on GATE to control the
external MOSFET in a constant current mode.
During this time CT is charging, as described above. If this condition lasts long enough for CT to charge to 1.5 V,
a fault will be declared and the MOSFET will be turned off. The IMAX current is calculated as follows:
I
MAX +
V
CSP *
V
IMAX
R
SENSE
Note that if the voltage on the IMAX pin is programmed to be less than 50 mV below CSP, then the UC3919 will
control the MOSFET in a constant current mode all the time. No fault will be declared and the MOSFET will
remain on because IMAX is less than IFAULT.
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