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參數(shù)資料
| 型號(hào)： | CS3845BGD8 |
| 廠商： | ZF Electronics Corporation |
| 英文描述： | Current Mode PWM Control Circuit with 50% Max Duty Cycle |
| 中文描述： | 電流模式PWM控制電路的最大占空比為50％ |
| 文件頁數(shù)： | 5/6頁 |
| 文件大小： | 149K |
| 代理商： | CS3845BGD8 |
5
C
Setting the Oscillator
The parameters T
c
and T
d
can be determined as follows:
(
Grounding
High peak currents associated with capacitive loads neces-
sitate careful grounding techniques. Timing and bypass
capacitors should be connected close to Gnd in a single
point ground.
The transistor and 5k
potentiometer are used to sample
the oscillator waveform and apply an adjustable ramp to
Sense.
t
on
t
off
t
d
V
upper
V
lower
t
C
t
on =
t
C
t
off =
t
C+
2t
d
Circuit Description: continued
Substituting in typical values for the parameters in the
above formulas:
V
REF
= 5.0V, V
upper
= 2.7V, V
lower
= 1.0V, I
d
= 8.3mA,
then
t
c
≈
0.5534R
T
C
T
t
d
= R
T
C
T
ln
For better accuracy R
T
should be
≥
10k
.
)
2.3 - 0.0083 R
T
4.0 - 0.0083 R
T
(
V
CC
I
O
V
O
Switch
Current
EA Output
Toggle
F/F Output
OSC
RESET
V
OSC
Figure 2: Timing Diagram
Figure 3: Timing Parameters.
t
c
= R
T
C
T
ln
t
d
= R
T
C
T
ln
)
V
REF
- I
d
R
T
- V
lower
V
REF
- I
d
R
T
- V
upper
(
)
V
REF
- V
lower
V
REF
- V
upper
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