參數(shù)資料
型號(hào)： 2845B
廠商： Texas Instruments, Inc.
英文描述： HIGH-PERFORMANCE CURRENT-MODE PWM CONTROLLERS
中文描述： 高性能的電流模式PWM控制器
文件頁(yè)數(shù)： 11/21頁(yè)
文件大?。?/td> 336K
代理商： 2845B
www.ti.com
APPLICATION INFORMATION
Z
i
Z
f
VFB
COMP
2.5 V
0.5 mA
Error
Amplifier
+
R
S
C
f
R
f
Error
Amplifier
2R
R
1 V
Current-Sense
Comparator
I
S
(see Note A)
+
I
SENSE
COMP
GND
C
T
R
T
V
REF
R
T
/C
T
GND
TL284xB, TL384xB
HIGH-PERFORMANCE CURRENT-MODE PWM CONTROLLERS
SLVS610A–AUGUST 2006–REVISED SEPTEMBER 2006
The error-amplifier configuation circuit is shown in
Figure 1
.
A.
Error amplifier can source or sink up to 0.5 mA.
Figure 1. Error-Amplifier Configuration
The current-sense circuit is shown in
Figure 2
.
A.
B.
Peak current (I
S
) is determined by the formula: I
S(max)
= 1 V/R
S
A small RC filter formed by resistor R
f
and capacitor C
f
may be required to suppress switch transients.
Figure 2. Current-Sense Circuit
The oscillator frequency is set using the circuit shown in
Figure 3
. The frequency is calculated as:
f = 1 / R
T
C
T
For R
T
> 5 k
:
f
≈
1.72 / R
T
C
T
Figure 3. Oscillator Section
11
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