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參數(shù)資料
| 型號(hào)： | MC44605P |
| 廠商： | ON SEMICONDUCTOR |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | RW-S Series - Econoline Regulated DC-DC Converters; Input Voltage (Vdc): 05V; Output Voltage (Vdc): 05V; Power: 2W; DIP24 Low Profile Miniature Package; 1kVDC Isolation; Feedback Regulated Output; 2:1 Wide Range Voltage Input; Continuous Short Circuit Protection; Less than 7mm Height; SMD Pinning Option; Efficiency to 87% |
| 中文描述： | 0.75 A SWITCHING CONTROLLER, 250 kHz SWITCHING FREQ-MAX, PDIP16 |
| 封裝： | PLASTIC, DIP-16 |
| 文件頁數(shù)： | 14/20頁 |
| 文件大?。?/td> | 328K |
| 代理商： | MC44605P |
MC44605
http://onsemi.com
14
Figure 9. Overvoltage Protection
VCC
Vref
0
T
2.5 V
(Vref)
2.5 V
5.0
μ
s
VOVP out
2.0
μ
s
(If VOVP out = 1.0,
the Output is Disabled)
In
Out
Delay
τ
Enable
COVLO
Delay
In
Out
τ
A delay (2
μ
s) is incorporated in order to avoid any
activation due to interferences by only taking into account
the overvoltages that last at least 2
μ
s.
The VCC is connected when once the circuit has
started–up in order to limit the circuit start–up consumption
(T is switched on when once Vref has been generated).
The overvoltage section is enabled 5
μ
s after the regulator
has started to allow the reference Vref to stabilize.
E.H.T. Overvoltage Protection Section
This block uses the synchronization input as this section
is incorporated to detect too high synchronization pulses and
then to activate the device definitive latch in this case.
Figure 10. E.H.T. OVP
Negative Active
Clamping System
Pin 9
r2
2R
Synchronization
Block
VCC
Disabling
Block
Synchro.
Pulses
r1
R
E.H.T.
OVP
CEHTOVP
Vref
MC44605
4 V
This block consists of a high impedance resistors bridge
(R is nearly equal to 50 k
– refer to Figure 10) so that the
EHTovp threshold is 7.5 V. So, using an external resistors
bridge (r1, r2 <<R), the synchronization pulse level above
which the working must be considered as wrong, can be
adjusted.
For instance, if this threshold value is required to be equal
to 30 V, Vpin9 must be equal to 7.5 V when the
synchronization pulse value is 30 V.
So, in this case:
30
r2
r1
r2
7.5
Then, the ratio (r1/r2) can be deducted:
r1
r2
3
So, as r1 and r2 must be negligible in relation to R (about
50 k
), the couple of resistors can be chosen as follows:
r1
and:
3 k
r2
1 k
Winding Short Circuit Detection Section (WSCD)
The MC44605 being designed to control a Fly–Back
SMPS, this block is incorporated to detect a short circuit on
a transformer winding or on an output diode (refer to
Figure 11).
Figure 11. Winding Short Circuit Fault
AC Line
+
MC44605
RS
+
+
Lleak
Lp
In the case of a Winding Short Circuit, the primary
inductor Lp is short circuited and then the current increase
is only controlled by the leakage inductor Lleak.
In current mode, the power switch conduction is stopped
when the inductor current is detected as high enough, by the
controller. In fact, when the current sense resistor (Rs)
voltage gets equal to Vcs, the current sense comparator
switches to reset the output.
Now, the circuit has a propagation delay and the power
switch needs some time to turn off. Consequently, there is a
delay
δ
t between the moment at which the Rs voltage gets
equal to Vcs and the actual current increase stop. So, this
results in an overcurrent (refer to Figure 12).
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