參數(shù)資料
型號(hào)： NCP1212P
廠商： ON SEMICONDUCTOR
元件分類： 穩(wěn)壓器
英文描述： Current Mode PWM Controller for Both Forward and Flyback Converters
中文描述： 1 A SWITCHING CONTROLLER, 200 kHz SWITCHING FREQ-MAX, PDIP8
封裝： PLASTIC, DIP-8
文件頁(yè)數(shù)： 14/22頁(yè)
文件大?。?/td> 200K
代理商： NCP1212P
NCP1212
http://onsemi.com
14
Figure 38. Overload Detection Block Diagram
1 V
Q
D
S
CLK
Q
D
CLK
+5 V
8 A
28 A
+
+
+
+
Current Limit
From
Current
Sense
+
OSC
Clock
CT
DMAX
Max. Duty
Cycle
48% or 82%
+
3.2 V
+
Q
S
Q
Overload Enable
Reset
+
+
0.5 V
Overload
Shutdown
SS/DMAX
Brownout Protection
NCP1212 has a builtin comparator for brownout
detection as shown in Figure 39. Positive terminal of the
comparator is connected to a +1.21 V bandgap reference.
The IC is prohibited from switching until Brownout Detect
pin exceeds 1.21 V. Once the brownout detect threshold is
exceeded, 45 A flows out of the pin and the voltage at this
pin is further pushed up to provide hysteresis effect. The
Brownout voltage setting is determined by the potential
divider formed with R
Upper
and R
Lower
. Equations to
calculate the resistors are shown below:
RUpper
RLower
(VBulk_H
VBulk_L)
45 A
RLower
[1.21 V(VBulk_H
(45 A
VBulk_L)]
VBulk_H)
Where V
Bulk_H
and V
Bulk_L
are the desired upper and
lower bulk capacitor voltage for brownout detection.
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參數(shù)描述
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NCP1215 制造商:ONSEMI 制造商全稱:ON Semiconductor 功能描述:Low Cost Variable OFF Time Switched Mode Power Supply Controller
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