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參數(shù)資料
| 型號(hào)： | FSR510R09GZ |
| 廠商： | FAIRCHILD SEMICONDUCTOR CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHING CONTROLLER, ZFM6 |
| 封裝： | ROHS COMPLIANT, TO-220, 6 PIN |
| 文件頁數(shù)： | 11/12頁 |
| 文件大?。?/td> | 0K |
| 代理商： | FSR510R09GZ |
2009 Fairchild Semiconductor Corporation
www.fairchildsemi.com
FSR510 Rev. 1.0.4
8
FSR510
—
Highly
Integrated
Synchronous
Rectificati
on
Combination
Controller
The linear predict timing control circuit generates a
replica (VCT) of magnetizing current of flyback
transformer using internal timing capacitor (CT), as
shown in Figure 7. Using the internal capacitor voltage,
the inductor discharge time (tL.DIS) can be detected
indirectly, as shown in the last waveform of Figure 6.
When CT is discharged to zero, the SR controller turns
off the SR MOSFET.
The voltage-second balance equation for the primary
side inductance of flyback converter is given as
..
IN
PM ON
OUT
L DIS
Vt
n V
t
=
(1)
Then, the inductor current discharge time is given as:
.
IN
PM ON
LDIS
OUT
Vt
t
nV
=
(2)
When the voltage scale-down ratio between RES and
LPC is defined as K as below:
(
)
()
2
1
2
4
3
4
/
R
K
+
=
(3)
The current-second balance equation for internal timing
capacitor (CT) is obtained as:
..
5
((
)
IN
OUT
PM ON
OUT
CT DIS
V
VV
t
V
t
Kn
+
=
(4)
Then, the discharge time of CT is given as:
.
5
((
)
IN
OUT
PM ON
CT DIS
OUT
V
VV
t
Kn
t
V
+
=
(5)
When the voltage scale-down ratio between RES and
LPC (K) is 5, the discharge time of CT (tCT.DIS) is same
as inductor current discharge time (tL.DIS). However,
considering the tolerance of voltage divider resistors
and internal circuit, the scale-down ratio (K) should be
larger than 5 to guarantee that tCT.DIS is shorter than
tL.DIS. It is typical to set K around 5.5~6.
Since the voltage-to-current conversion circuit for the
LPC pin is enabled only when LPC voltage goes above
0.075VOUT+0.1, as shown in the third waveform of
Figure 7, the voltage divider for LPC should be
determined so that it can satisfy:
.
2
12
()
0.075
0.1
IN MIN
OUT
V
R
VV
RR
n
+
>
+
(6)
where VIN.MIN is the minimum input voltage of the flyback
converter.
When designing the voltage divider networks for LPC
and RES, the linear operation range of LPC and RES
(1~4V) should be also considered as:
.
2
12
()
4
IN MAX
OUT
V
R
V
RR
n
+
<
+
(7)
4
3
4
<
+
OUT
V
R
(8)
DCM Operation
FSR510
can
be
also
used
for
Discontinuous
Conduction Mode (DCM) or extended quasi-resonant
operation (valley switching). In DCM operation, the DET
voltage continues resonating until the primary-side
MOSFET is turned on, as depicted in Figure 8. While
DET voltage is resonating, DET voltage and LPC
voltage drop to zero by resonance, which can trigger
the turn-on of the SR MOSFET. To prevent fault
triggering of the SR MOSFET in DCM operation,
blanking time is introduced for LPC voltage. The SR
MOSFET is not turned on even when LPC voltage
drops below 0.05VOUT+0.1 unless LPC voltage stays
above 0.075VOUT +0.1 longer than the blanking time
(1
μs). The turn-on of the SR MOFET is inhibited for
2.5
μs once the SR MOSFET is turned off to prevent
fault triggering.
V
OUT
V
DET
IM
V
IN/n
Primary
MOSFET
V
GS
Synchronous Rectifier
MOSFET
V
CT
V
LPC
0.075 V
OUT+0.1
t
PM.ON
IDS
ISR /n
V
IN/n+VOUT
t L.DIS
t
CT.DIS
Blanking time
0.05 VOUT+0.1
Figure 8. DCM Operation of FSR510
Green-Mode Operation
To minimize the power consumption at light-load
condition, the SR circuit is disabled when the load
decreases. As illustrated in Figure 9, the discharge
times of inductor and internal timing capacitor decrease
as load decreases. When the discharge time of internal
timing capacitor is shorter than tGREEN-ON (around 4.8s)
for more than nine cycles, the SR circuit enters green
mode, as shown in Figure 9. Once FSR510 enters
green mode, the SR MOSFET stops switching and the
major internal block is shut down to further reduce
operating current of the SR controller. In green mode,
the operating current reduces to 800A. This allows
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