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参数资料
| 型号： | S-8338AAEC-P8T1 |
| 元件分类： | 稳压器 |
| 英文描述： | 0.16 A SWITCHING CONTROLLER, 1133 kHz SWITCHING FREQ-MAX, DSO8 |
| 封装： | SON-8 |
| 文件页数： | 11/49页 |
| 文件大小： | 554K |
| 代理商： | S-8338AAEC-P8T1 |
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STEP-UP, 1.2 MHz HIGH-FREQUENCY, PWM CONTROL SWITCHING REGULATOR CONTROLLERS
Rev.2.1_01
S-8337/8338 Series
Seiko Instruments Inc.
19
5. Oscillation frequency and maximum duty ratio setting resistors (ROSC, RDuty)
With the S-8337/8338 Series, the oscillation frequency can be set in a range of 286 kHz to 1.133 MHz
using external resistance. Connect a resistor across the ROSC and VSS pins. Select the resistor by
using the following equation and referring to Figure 11. However, the following equation and figure
assume that the resistance value is the desired value and show the theoretical values when the IC is
in the typical conditions. Note that fluctuations of resistance and IC are not considered.
140 10
3
ROSC [k
]
fOSC [kHz]
1400
1200
1000
800
600
400
200
0
200
400
600
f OS
C
[k
H
z]
ROSC [k
]
Figure 11 ROSC vs. fOSC
With the S-8337 Series, the maximum duty ratio can be set in a range of 47% to 88.5% by an external
resistor. Connect the resistor across the RDuty and VSS pins. Select the resistance by using the
following equation and referring to Figure 12. The maximum duty ratio fluctuates according to the
oscillation frequency. If the value of ROSC is changed, therefore, be sure to change the value of
RDuty so that it is always in proportion to ROSC. However, the following equation and figure assume
that the resistance value is the desired value and show the theoretical values when the IC is in the
typical conditions. Note that fluctuations of resistance and IC are not considered.
(94.5
MaxDuty)
ROSC
RDuty
11.5
100
90
80
70
60
50
40
0
2
4
5
M
a
xD
uty
[%]
RDuty/ROSC
13
Figure 12 RDuty/ROSC vs. MaxDuty
Connect resistors ROSC and RDuty as close to the IC as possible.
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PDF描述 |
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| S-8338ACAA-T8T1 | 0.16 A SWITCHING CONTROLLER, 1133 kHz SWITCHING FREQ-MAX, PDSO8 |
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相关代理商/技术参数 |
参数描述 |
|---|---|
| S-8338AAHB-P8T1G | 制造商:Seiko Instruments Inc (SII) 功能描述:STEPUP1.2MHZ PWM SWR |
| S-8338AAHB-T8T1G | 制造商:Seiko Instruments Inc (SII) 功能描述:STEPUP1.2MHZ PWM SWR |
| S-8338ABAA-P8T1G | 制造商:Seiko Instruments Inc (SII) 功能描述: |
| S-8338ABAA-T8T1G | 制造商:Seiko Instruments Inc (SII) 功能描述: |
| S-8338ABAC-P8T1G | 制造商:Seiko Instruments Inc (SII) 功能描述:STEPUP1.2MHZ PWM SWR |
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