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HFC0300 Datasheet(PDF) 15 Page - Monolithic Power Systems

No. de Pieza. HFC0300
Descripción  Variable Off Time Controller
Descarga  21 Pages
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Fabricante  MPS [Monolithic Power Systems]
Página de inicio  http://www.monolithicpower.com
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HFC0300 Datasheet(HTML) 15 Page - Monolithic Power Systems

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HFC0300– VARIABLE OFF TIME CONTROLLER
HFC0300 Rev. 1.0
www.MonolithicPower.com
15
9/23/2011
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2011 MPS. All Rights Reserved.
the power supply is at start-up or load transition
phase. Therefore, set the output voltage in less
than 6000 switching cycles during start-up.
Ramp Compensation Circuit
If the power supply operates in CCM and the
duty cycle is larger than 0.5, add a ramp
compensation circuit to avoid harmonics in peak
current
mode
control.
Usually,
the
ramp
compensation rate is selected as per equation
(10)
O
sense
m
VN R
k
L

 
(10)
Where:
is the coefficient which is usually 0.5 to
1.0
 Rsense is the value of primary sense
resistor
For applications using the HFC0300, use the
ramp compensation circuit shown in Figure 13 .
GND
CS
DRV
HFC0300
1
2
3
4
5
6
8
FSET
HV
VCC
COMP
VCC
CS
510K
33pF
1K
30K
R1
R2
R3
C1
Figure 13: Ramp Compensation Circuit
Equation (11) estimates the compensation rate of
the above circuit :
DRV
1
2
VR
k*
R
(11)
Where VDRV is the drive voltage
31
R* C
 
Select
to be larger than the switching period so
that the ramp is approximately linear.
Design Summary
Figure 14 shows a detailed reference design of
the off-time controlled flyback converter using the
HFC0300. The input voltage is 90VAC to
265VAC and the output is 24V/1.5A.
The transformer used in this design has a turn
ratio of 84:14:8 (Np: Ns: Naux) with a primary
inductance of 818μH. The core is EE25. Figure
15, Figure 16, and Table 1 Winding Ordershow
wiring schematics.


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