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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)： | 16/20頁 |
| 文件大?。?/td> | 328K |
| 代理商： | MC44605P |
MC44605
http://onsemi.com
16
and:
Vcs
RS
Ipk
So:
VMPL
2
RMPL
Γ
MPL
LP
CT
R2
S
Pin
A comparator is used to compare VMPL to Vref, the output
of which, DisMPL, is connected to the “definitive inhibition
latch” of the disabling block. So, when the calculated power
is higher than the threshold, the circuit is definitively
disabled (the system considers that there is an overload
condition).
Finally, replacing VMPL by 2.5 V (the threshold value),
the RMPL value to be used, can be deducted:
1.25
RMPL
LP
Γ
MPL
CT
R2
S
(Pin)max
Figure 14. OHD and MPL
2.5 V
DisOHD
VMPL
Disabling
Block
2.5 V
VMPL
DisMPL
R
O
C
O
R
M
C
M
x
Vcs
kMPLVcs2
kOHDVcs2
TOHD
TMPL
Output
MC44605
Sf
Overheating Detection Section (O.H.D.)
In the MPL block, the converter input power is calculated.
In the O.H.D. block, that is the power MOSFET heating
which is calculated, using the following equation:
pon
1
3
Rdson
Ipk2
d
where: pon are the power switch on–time losses
Rdson is the conduction MOSFET resistor
d is the duty cycle
As in the MPL section, the squared Ipk term is estimated
by building a current source proportional to Vcs2.
The duty cycle is taken into account thanks to the action
on this current source of a “chopper” controlled by the
circuit output. By this means, the pin 6 average current is
proportional to the squared peak current multiplied to the
duty cycle (refer to Figure 14).
So, using an external resistor and capacitor network
(ROHD, COHD) on his pin, a voltage VOHD, proportional o
the conduction losses can be obtained.
Like in the MPL block, this voltage VOHD, is compared to
2.5 V. If VOHD gets higher than this threshold, the disabling
block is activated by DisOHD (output of the comparator).
The external resistor ROHD choice enables to obtain a
calculated VOHD equal to 2.5 V when the conduction losses
are equal to their maximum value.
In effect,
VOHD
ROHD
kOHD
Vcs2
d
where: kOHD is the multiplier gain
Now, as kOHD that is depending on the reference current
source Iref, is proportional to 1/Rref:
kOHD
k2
1
Rref
where: k2 is a constant
So:
VOHD
ROHD
k2
Vcs2
Rref
d
Finally:
VOHD
ROHD
Γ
OHD
Rref
Vcs2
d
where:
Γ
OHD is the OHD parameter as defined in the
specification. This is a constant equal to k2.
Now, as:
Vcs
RS
Ipk
So, replacing Vcs and using the pon equation:
VOHD
3
ROHD
Rref
Γ
OHD
Rdson
R2
S
pon
So, by choosing the value of ROHD, the heating
corresponding to Vref is determined. If the MOSFET
dissipation is such that the heating is higher than this
threshold, the “definitive inhibition latch” of the Disabling
Block is activated and so, the output gets definitively
disabled.
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