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| 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： | 5/49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.
13
6. Error amplifier
The error amplifier outputs the PWM control signal so that the voltage of the FB pin is held at a specific
value (1 V). By connecting a resistor (RZ) and capacitor (CZ) to the output pin (CC pin) of the error
amplifier in series, an optional loop gain can be set, enabling stabilized phase compensation.
7. Operation
The following are basic equations [(1) through (7)] of the step-up switching regulator (refer to
Figure 9
).
D
L
CL
M1
FB
CONT
VIN
EXT
VSS
VOUT
Figure 9 Step-up Switching Regulator Circuit for Basic Equations
Voltage at the CONT pin at the moment M1 is turned ON (current IL flowing through L is zero), VA:
VA
= VS
*1……………………………………………………………………………………………….…(1)
*1.
VS: Non-saturated voltage of M1
Change in IL over time:
L
V
L
V
dt
dl
S
IN
L
=
…………………………………………………………………………………..…(2)
Integration of the above equation:
t
L
V
I
S
IN
L
=
…………………………………………………………………….…………….……(3)
IL flows while M1 is ON (ton). This time is determined by the oscillation frequency of OSC.
Peak current (IPK) after tON:
ON
S
IN
PK
t
L
V
I
=
……………………………………………………………………………………(4)
The energy stored in L is represented by
L(IPK)
2.
When M1 is turned OFF (tOFF), the energy stored in L is released via a diode, generating a reverse
voltage (VL).
VL:
() IN
D
OUT
L
V
+
=
*2
……….………………………………………………………..………………(5)
*2.
VD: Diode forward voltage
The voltage on the CONT pin rises only by VOUT
+ VD.
1
2
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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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