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參數(shù)資料
| 型號： | UCC2882- |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | Average Current Mode Synchronous Controller With 5-Bit DAC |
| 中文描述： | 平均電流模式同步控制器，5位DAC |
| 文件頁數(shù)： | 7/14頁 |
| 文件大?。?/td> | 579K |
| 代理商： | UCC2882- |
7
UCC2882/-1
UCC3882/-1
Figure 1. Application circuit - Pentium
II power supply.
UDG-97048-1
FREQUENCY
(kHz)
100
200
300
400
500
600
700
R
T
(k
)
14.7
11.0
10.5
11.3
12.7
10.7
11.0
C
T
(pF)
5600
3900
2700
1800
1200
1200
1000
Table 2. Programming Standard Frequencies
An excessively long delay time between gate drive sig-
nals, or a delay time that is too small, will result in a inef-
ficient
power
supply
design.
programming the oscillator is to observe the actual circuit
waveforms to insure that the delay is optimal. The de-
signer should vary R
T
and C
T
accordingly to adjust the
delay time and to program the proper oscillator fre-
quency.
The
third
step
in
Using an External Schottky Diode in Parallel With the
Low Side MOSFET
The purpose of using a synchronous buck regulator is to
substitute a low voltage drop MOSFET in place of a
Schottky diode as the low side switch. An external
Schottky diode may still be required however, in order to
reduce the losses due to the reverse recovery of the
low-side MOSFET body diode. Figure 4 illustrates the ef-
fects on power losses due to the non-ideal nature of a
typical MOSFET body diode. I
RM
is the peak recovery
current of the body diode of Q2 and I
LOUT
is the current
of the output inductor. Using a parallel Schottky diode
can reduce these losses and increase circuit efficiency.
The size of the diode should be increased as a function
of load current, input voltage, and operating frequency.
The diode should be as close to the lower MOSFET, Q2,
as possible, to reduce stray inductance.
APPLICATION INFORMATION (continued)
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