參數(shù)資料
型號(hào)： NCP1395BPG
廠商： ON SEMICONDUCTOR
元件分類： 穩(wěn)壓器
英文描述： High Performance Resonant Mode Controller
中文描述： SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PDIP16
封裝： LEAD FREE, PLASTIC, DIP-8
文件頁(yè)數(shù)： 21/27頁(yè)
文件大小： 345K
代理商： NCP1395BPG
NCP1395A/B
http://onsemi.com
21
To the contrary, when the internal BO signal is high
(A and B pulse), the IBO source is activated and creates
a hysteresis. The hysteresis level actually depends
on the circuit: NCP1395A features a 28 A whereas
the NCP1395B uses a 83
A current. Changes are
implemented to a) reduce the standby power on the
NCP1395A b) improve the noise immunity on the
NCP1395B. Knowing these values, it becomes possible to
select the turnon and turnoff levels via a few lines of
algebra:
IBO is off
V(
)
Vbulk1
Rlower
Rlower
Rupper
(eq. 1)
IBO is on
V(
)
Vbulk2
Rlower
Rlower
Rupper
IBO
Rlower
Rlower
Rupper
Rupper
(eq. 2)
We can now extract Rlower from Equation 1 and plug it
into Equation 2, then solve for Rupper:
Rupper
Rlower
Vbulk1VBO
VBO
Rlower
VBO
Vbulk1Vbulk2
IBO
(Vbulk1VBO)
If we decide to turn on our converter for Vbulk1 equals
350 V, and turn it off for Vbulk2 equals 250 V, then we
obtain:
IBO = 28 A
Rupper = 3.6 M
Rlower = 10 k
The bridge power dissipation is 400
2
/3.601 M =
45 mW when the frontend PFC stage delivers 400 V.
IBO = 83 A
Rupper = 1.2 M
Rlower = 3.4 k
The bridge power dissipation is 132 mW when the
frontend PFC stage delivers 400 V. Figure 46 simulation
result confirms our calculations.
LatchOff Protection
There are some situations where the converter shall be
fully turned off and stay latched. This can happen in
presence of an overvoltage (the feedback loop is drifting)
or when an overtemperature is detected. Due to the addition
of a comparator on the BO pin, a simple external circuit can
lift up this pin above VLATCH (5.0 V typical) and
permanently disable pulses. The V
CC
needs to be cycled
down below 5.0 V typically to reset the controller.
+
20 s
RC
To permanent
latch
+
Vlatch
IBO
Vdd
+
BO
+VBO
BO
Rlower
Rupper
Vbulk
V
CC
Q1
NTC
Vout
Figure 47. Adding a comparator on the BO pin offers a way to latchoff the controller.
In Figure 47, Q1 is blocked and does not bother the BO
measurement as long as the NTC and the optocoupler are
not activated. As soon as the secondary optocoupler senses
an OVP condition, or the NTC reacts to a high ambient
temperature, Q1 base is brought to ground and the BO pin
goes up, permanently latching off the controller.
相關(guān)PDF資料
PDF描述
NCP1395A High Performance Resonant Mode Controller(高性能諧振模式控制器)
NCP1395B High Performance Resonant Mode Controller(高性能諧振模式控制器)
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