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參數(shù)資料
| 型號： | MB3881PFF |
| 廠商： | FUJITSU LTD |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 8-ch DC/DC Converter IC with Synchronous Rectifier for Voltage Step-up and Step-down |
| 中文描述： | 0.2 A SWITCHING CONTROLLER, 800 kHz SWITCHING FREQ-MAX, PQFP64 |
| 封裝： | PLASTIC, LQFP-64 |
| 文件頁數(shù)： | 27/40頁 |
| 文件大小： | 509K |
| 代理商： | MB3881PFF |
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MB3881
27
I
SETTING FOR EXTERNAL SYNCHRONOUS OSCILLATION
For external synchronous operation, connect the timing capacitor (C
T
) to the CT terminal (pin 34) and the timing
resistor (R
T
) to the RT terminal (pin 33).
In this case, select the C
T
and R
T
so that the oscillation frequency is 5% to 10% lower than the frequency of the
external synchronous signal excluding the setting error of the oscillation frequency.
The duty cycle (T1/T) of the external synchronous signal must be set within a range from 10% to 90%.
Note: If the external synchronous pulse is not input, the device is started with free-run oscillation.
For free-run oscillation, set the SYNC terminal (pin 35) to “Lo” or “HiZ” level.
The external synchronization circuit starts operation after a VREF rise.
The CT pin oscillation frequency at startup is 500 kHz when the voltage at the VB terminal (pin 36) is 2 V
with CT = 100 pF and RT = 11 k
.
If the triangular wave has superimposed noise during external synchronous oscillation, insert a CR filter.
+
VB
CT
34
CT
SYNC
35
100 k
0.8 V
0.3 V
1.4 V
I
+
+
Latch1
S
R
Q
S
R
Q
Latch2
1.5 I
Ι
: Proportional to V
RT
/R
T
t
0.8 V
V
CT
0.3 V
5.0 V
V
SYNC
0 V
t
T
T1
0.8 V
V
CT
0.3 V
5.0 V
V
SYNC
0 V
Triangular wave oscillator (OSC) equivalent circuit
Free-run oscillation
External synchronous oscillation
“H” level: ON
External synchronization circuit
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|---|---|
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| MB3882PFV | 制造商:FUJITSU 制造商全稱:Fujitsu Component Limited. 功能描述:2-channel DC/DC Converter IC with Synchronous Rectifier |
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