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参数资料
| 型号： | FSEZ1307MY |
| 厂商： | Fairchild Semiconductor |
| 文件页数： | 10/16页 |
| 文件大小： | 0K |
| 描述： | IC PWM CTLR PRIMARY REG 7-SOIC |
| 标准包装： | 2,500 |
| 输出隔离： | 隔离 |
| 频率范围： | 47kHz ~ 53kHz |
| 输入电压： | 5.5 V ~ 30 V |
| 输出电压： | 700V |
| 功率（瓦特）： | 660mW |
| 工作温度： | -40°C ~ 105°C |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽）7 引线 |
| 供应商设备封装： | 7-SOP |
| 包装： | 带卷 (TR) |
Functional Description
side regulated flyback converter, with typical waveforms
constant voltage regulation mode, V COMV determines the
duty cycle while V COMI is saturated to HIGH. During
shown
in
Generally, discontinuous
constant current regulation mode, V COMI determines the
conduction mode (DCM) operation is preferred for
primary-side regulation because it allows better output
regulation. The operation principles of DCM flyback
duty cycle while V COMV is saturated to HIGH.
converter are as follows:
During the MOSFET on time (t ON ), input voltage (V DL ) is
N p :N s
D
I D
I O
applied across the primary-side inductor (L m ). Then
MOSFET current (I ds ) increases linearly from zero to the
peak value (I pk ). During this time, the energy is drawn
V AC
+
V DL
L m
+ V F -
+
V O
L
O
A
D
from the input and stored in the inductor.
When the MOSFET is turned off, the energy stored in
-
-
I O
V COMI
V O
Ref
the inductor forces the rectifier diode (D) to be turned
on. While the diode is conducting, the output voltage
(V o ), together with diode forward-voltage drop (V F ), is
applied across the secondary-side inductor ( L m × N s2 /
N p2 ) and the diode current (I D ) decreases linearly from
the peak value (I pk × N p /N s ) to zero. At the end of inductor
current discharge time (t DIS ), all the energy stored in the
inductor has been delivered to the output.
When the diode current reaches zero, the transformer
auxiliary winding voltage (V w ) begins to oscillate by the
resonance between the primary-side inductor (L m ) and
EA_I
Estimator
Ref
PWM t DIS
Control Detector
V COMV
Estimator
EA_V
Primary-Side Regulation
Controller
CS
V S
V DD
R CS
R S1
R S2
I ds
N A
+
V w
-
the effective capacitor loaded across the MOSFET.
During the inductor current discharge time, the sum of
output voltage and diode forward-voltage drop is
reflected to the auxiliary winding side as (V o +V F ) ×
N a /N s . Since the diode forward-voltage drop decreases
as current decreases, the auxiliary winding voltage
reflects the output voltage best at the end of diode
conduction time where the diode current diminishes to
zero. Thus, by sampling the winding voltage at the end
of the diode conduction time, the output voltage
information can be obtained. The internal error amplifier
for output voltage regulation (EA_V) compares the
Figure 24. Simplified PSR Flyback Converter Circuit
I ds (MOSFET Drain-to-Source Current)
I pk
I D (Diode Current)
sampled voltage with internal precise reference to
generate error voltage (V COMV ), which determines the
duty cycle of the MOSFET in CV mode.
Meanwhile, the output current can be estimated using
the peak drain current and inductor current discharge
I pk ?
N P
N S
I D . avg = I o
time because output current is same as the average of
V w (Auxiliary Winding Voltage)
the diode current in steady state.
The output current estimator picks up the peak value of
the drain current with a peak detection circuit and
calculates the output current using the inductor
discharge time (t DIS ) and switching period (t s ). This
V F ?
N A
N S
V O ?
N A
N S
output information is compared with internal precise
reference to generate the error voltage (V COMI ), which
determines the duty cycle of the MOSFET in CC mode.
With Fairchild’s innovative TRUECURRENT?
technique, constant current (CC) output can be
precisely controlled.
t ON
t S
t DIS
Figure 25. Key Waveforms of DCM Flyback
Among the two error voltages, V COMV and V COMI , the
smaller one determines the duty cycle. Therefore, during
? 2010 Fairchild Semiconductor Corporation
FSEZ1307 ? Rev. 1.0.3
10
Converter
www.fairchildsemi.com
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