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參數(shù)資料
| 型號(hào)： | CS2845LDWR16 |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 1 A SWITCHING CONTROLLER, PDSO16 |
| 封裝： | SO-16 |
| 文件頁(yè)數(shù)： | 5/6頁(yè) |
| 文件大小： | 157K |
| 代理商： | CS2845LDWR16 |
5
Setting the Oscillator
The times Tc and Td 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.
CS2844/3845
SERIES
ton
toff
Vupper
Vlower
tC
td
ton = tC
toff = tC+2td
Circuit Description: continued
Substituting in typical values for the parameters in the
above formulas:
VREF = 5.0V, Vupper = 2.7V, Vlower = 1.0V, Id = 8.3mA,
then
tc ≈ 0.5534RTCT
td = RTCT ln
For better accuracy RT should be ≥10k.
)
2.3 - 0.0083 RT
4.0 - 0.0083 RT
(
VCC
IO
VO
Switch
Current
EA Output
Toggle
F/F Output
OSC
RESET
VOSC
Figure 2: Timing Diagram
Figure 3: Duty Cycle parameters.
tc = RTCT ln
td = RTCT ln
)
VREF - IdRT - Vlower
VREF - IdRT - Vupper
(
)
VREF - Vlower
VREF - Vupper
(
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