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参数资料
| 型号： | FSEZ1216NY |
| 厂商： | Fairchild Semiconductor |
| 文件页数： | 10/16页 |
| 文件大小： | 0K |
| 描述： | IC PWM PRIMARY REG MOSFET 8-DIP |
| 产品变化通告： | Product Discontinuation 27/Feb/2012 |
| 标准包装： | 50 |
| 输出隔离： | 隔离 |
| 频率范围： | 39kHz ~ 45kHz |
| 输入电压： | 5.5 V ~ 25 V |
| 输出电压： | 600V |
| 功率（瓦特）： | 800mW |
| 工作温度： | -40°C ~ 105°C |
| 封装/外壳： | 8-DIP（0.300"，7.62mm） |
| 供应商设备封装： | 8-DIP |
| 包装： | 管件 |
| 产品目录页面： | 1222 (CN2011-ZH PDF) |
Functional Description
Figure 24 shows the basic circuit diagram of primary-
side regulated flyback converter, with typical waveforms
shown in Figure 25. Generally, discontinuous
conduction mode (DCM) operation is preferred for
primary-side regulation since it allows better output
regulation. The operation principles of DCM flyback
converter are as follows:
V AC
+
V DL
-
N p :N s
L m
I D
D
+ V F -
I O
+
V O
-
L
O
A
D
During the MOSFET ON time (t ON ), input voltage (V DL ) is
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
from the input and stored in the inductor.
EA_I
V COMI
Ref
I O
Estimator
CS
R CS
I ds
applied across the secondary-side inductor ( L m × N s /
N p ) and the diode current (I D ) decreases linearly from
V O
Ref
When the MOSFET is turned off, the energy stored in
the inductor forces the rectifier diode (D) to turn on.
While the diode is conducting, the output voltage (V O ),
together with diode forward voltage drop (V F ), are
2
2
the peak value (I pk × N p /N s ) to zero. At the end of
PWM t DIS
Control Detector
V COMV
Estimator
EA_V
Primary-Side Regulation
Controller
V S
V DD
R S1
R S2
N A
+
V w
-
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
the effective capacitor loaded across 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
Figure 24. Simplified PSR Flyback Converter Circuit
I d s (MOSFET Drain-to-Source Current)
I pk
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. 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 sampled
I D (Diode Current)
I pk ?
N P
N S
I D . avg = I
o
V F ?
N S
V O ?
t ON
t
t
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
time since output current is same as the average of 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 ). These
output information is compared with internal precise
reference to generate error voltage (V COMI ), which
determines the duty cycle of the MOSFET in CC mode.
Among the two error voltages, V COMV and V COMI , the
smaller actually determines the duty cycle. During
constant voltage regulation mode, V COMV determines the
duty cycle while V COMI is saturated to HIGH. During
constant current regulation mode, V COMI determines the
duty cycle while V COMV is saturated to HIGH.
? 2009 Fairchild Semiconductor Corporation
FSEZ1216 ? Rev. 1.0.1
10
V W (Auxiliary Winding Voltage)
N A
N A
N S
DI S
S
Figure 25. Key Waveforms of DCM Flyback
Converter
www.fairchildsemi.com
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