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參數資料
| 型號： | MC33260PG |
| 廠商： | ON SEMICONDUCTOR |
| 元件分類： | 穩壓器 |
| 英文描述： | GreenLine TM Compact Power Factor Controller: Innovative Circuit for Cost Effective Solutions |
| 中文描述： | 0.5 A POWER FACTOR CONTROLLER, PDIP8 |
| 封裝： | LEAD FREE, PLASTIC, DIP-8 |
| 文件頁數： | 12/22頁 |
| 文件大小： | 232K |
| 代理商： | MC33260PG |
MC33260
http://onsemi.com
12
Pin Numbers are Relevant to the PDIP8 Version
Figure 29. PWM Latch
PWM
Latch
R
S
Q
Q
Synchronization
Arrangement
+
OVP, UVP
&
+
PWM Latch
Comparator
V
control
(V
pin2
Regulation Output)
Output
Buffer
7
ZCD & OCP
Current Sense
Comparator
60 mV
Oscillator Sawtooth
Output_Ctrl
ThStdwn
V
CC
5
A LEB (Leading Edge Blanking) has been implemented.
This circuitry disconnects the Current Sense comparator
from Pin 4 and disables it during the 400 first ns of the power
switch conduction. This prevents the block from reacting on
the current spikes that generally occur at power switch turn
on. Consequently, proper operation does not require any
filtering capacitor on Pin 4.
PROTECTIONS
OCP (Overcurrent Protection)
Refer to
Current Sense Block
.
OVP (Overvoltage Protection)
The feedback current (I
o
) is compared to a threshold
current (I
ovpH
). If it exceeds this value, the gate drive signal
is maintained low until this current gets lower than a second
level (I
ovpL
).
Figure 30. Internal Current Thresholds
Gate
Drive
Enable
V
control
I
o
I
uvp
I
regL
I
ovpH
I
ovpL
I
regH
So, the OVP upper threshold is:
VovpH
Vpin1
Ro
IovpH
where:
R
o
is the feedback resistor that is connected between
Pin 1 and the output voltage,
I
ovpH
is the internal upper OVP current threshold,
V
pin1
is the Pin 1 clamp voltage.
Practically, V
pin1
that is in the range of 2.5 V, can be
neglected. The equation can then be simplified:
VovpH
On the other hand, the OVP low threshold is:
Ro(M )
IovpH( A) (V)
VovpL
Vpin1
Ro
IovpL
where I
ovpL
is the internal low OVP current threshold.
Consequently, V
pin1
being neglected:
VovpL
The OVP hysteresis prevents erratic behavior.
I
ovpL
is guaranteed to be higher than IregH (refer to
parameters specification). This ensures that the OVP
function doesn’t interfere with the regulation one.
Ro(M )
IovpL( A) (V)
UVP (Undervoltage Protection)
This function detects when the feedback current is lower
than 14% of I
ref
. In this case, the PWM latch is reset and the
power switch is kept off.
This protection is useful to:
Protect the preregulator from working in too low
mains conditions.
To detect the feedback current absence (in case of a
nonproper connection for instance).
The UVP threshold is:
Vuvp
Vpin1
Ro(M )
Iuvp( A) (V)
Practically (V
pin1
being neglected),
Vuvp
Ro(M )
Iuvp( A) (V)
Maximum OnTime Limitation
As explained in
PWM Latch
, the maximum ontime is
accurately controlled.
Pin Protection
All the pins are ESD protected.
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