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参数资料
| 型号： | CS52845ED14 |
| 厂商： | ON SEMICONDUCTOR |
| 元件分类： | 稳压器 |
| 英文描述： | 1 A SWITCHING CONTROLLER, PDSO14 |
| 封装： | 0.150 INCH, MS-012, SO-14 |
| 文件页数： | 5/8页 |
| 文件大小： | 55K |
| 代理商： | CS52845ED14 |
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.
5
CS52845
Vupper
Vlower
ton
toff
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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