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參數(shù)資料
| 型號： | MB3789PFV |
| 廠商： | FUJITSU LTD |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | RADIATION HARDENED HIGH EFFICIENCY, 5 AMP SWITCHING REGULATORS |
| 中文描述： | 0.07 A SWITCHING CONTROLLER, 200 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封裝： | PLASTIC, SSOP-16 |
| 文件頁數(shù)： | 18/28頁 |
| 文件大?。?/td> | 214K |
| 代理商： | MB3789PFV |
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18
MB3789
1.
Soft Start
To prevent surge currents when the IC is turned on, you can set a soft start by connecting capacitor C
PE
to the
SCP pin (pin 5).
Softstart time(ts): Time required up to duty cycle 50% with output on
t
S
(s) 0.15
×
C
PE
(
μ
F)
~
2.
Protection from short circuit
SCP comparator 1 always compares the output voltage levels at error amplifiers 1 and 2 with the 1.25 V
reference voltage.
When the load conditions for the switching regulator are stable, the outputs from error amplifiers 1 and 2 do
not vary and thus short-circuit protection control remains balanced. In this case, the SCP pin (pin 5) is held at
the soft start end voltage (about 1.25 V).
If the load conditions change rapidly and the output voltage of error amplifier 1 or 2 reaches 1.25 V, for example,
because of a short-circuit of a load, capacitor C
PE
is charged further. When capacitor C
PE
is charged up to about
1.8 V, the SR latch is set and the output drive transistor is turned off. At this time, the dead time is set to 100%,
capacitor C
PE
is discharged, and the SCP pin becomes 50 mV.
Short-circuit detection time (t
PE
)
t
PE
(s) 0.09
×
C
PE
(
μ
F)
~
3.
Connection without using short-circuit protection
Add a clamp circuit as shown in Figure 11 so that the clamp voltage (V
CRP
) falls within the following range when
a short-circuit is detected: 1.0 V
<
V
CRP
<
1.7 V
~
~
5
V
CRP
C
PE
SCP
Clamp circuit
Figure 11 Connection without using short-circuit protection
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