DataSheet.es FSEZ1016A Hoja de datos PDF


PDF FSEZ1016A Datasheet ( Hoja de datos )

Número de pieza FSEZ1016A
Descripción Primary-Side-Regulation PWM Integrated Power MOSFET
Fabricantes Fairchild Semiconductor 
Logotipo Fairchild Semiconductor Logotipo
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FSEZ1016A datasheet

1 Page

FSEZ1016A pdf
Electrical Characteristics
VDD=15V and TA=-40°C~+125°C (TA=TJ), unless otherwise specified.
Symbol
Parameter
VDD Section
VOP
VDD-ON
VDD-OFF
IDD-ST
Continuously-Operating Voltage
Turn-On Threshold Voltage
Turn-Off Threshold Voltage
Startup Current
IDD-OP
Operating Current
IDD-GREEN Green Mode Operating Supply Current
VDD-OVP VDD OVP Level
tD-VDDOVP VDD OVP Debounce Time
Oscillator Section
Center Frequency
fOSC
Frequency
Frequency Hopping Range
fFHR Frequency Hopping Period
fOSC-N-MIN Minimum Frequency at No-Load
fOSC-CM-MIN Minimum Frequency at CCM
fDV Frequency Variation vs. VDD Deviation
fDT
Frequency Variation vs. Temperature
Deviation
Voltage-Sense Section
IVS-UVP Sink Current for Brownout Protection
www.DataSheet4UI.tccom IC Compensation Bias Current
VBIAS-COMV Adaptive Bias Voltage Dominated by VCOMV
Current-Sense Section
tPD Propagation Delay to Gate Output
tMIN-N
Minimum On Time at No-Load
tMINCC
Minimum On Time in CC Mode
VTH Threshold Voltage for Current Limit
Current-Error-Amplifier Section
VIR Reference Voltage
II-SINK
Output Sink Current
II-SOURCE Output Source Current
VI-HGH
Output High Voltage
Conditions
0<VDD<VDD-ON-0.16V
VDD=20V, fS= fOSC
VVS=2V, VCS=3V
CL=1nF
VDD=20V, VVS=2.7V
CL=1nF, VCOMV=0V
fS=fOSC-N-MIN, VCS=0V
VCS=3V, VVS=2.3V
fS=fOSC, VVS=2.3V
TA=25°C
TA=25°C
TA=25°C
VVS=2.7V, VCOMV=0V
VVS=2.3V, VCS=0.5V
TA=25°C, VDD=10V to
25V
TA=-40°C to +125°C
RVS=20k
VCOMV=0V, TA=25°C,
RVS=20K
VVS= -0.8V, RCS=2k
VCOMV=1V
VVS=0V, VCOMV=2V
VCS=3V, VCOMI=2.5V
VCS=0V, VCOMI=2.5V
VCS=0V
Min. Typ. Max. Units
25 V
15 16 17
V
4.5 5.0 5.5
V
3.7 10.0 μA
3.5 5.0 mA
1.0 2.5 mA
27 28 29
100 250 400
V
μs
40 43 46 KHz
±1.8 ±2.6 ±3.6
3 ms
550 Hz
20 KHz
5%
20 %
180 μA
9.5 μA
1.4 V
100
1100
300
1.3
200
ns
ns
ns
V
2.475 2.500 2.525
55
55
4.5
V
μA
μA
V
Continued on the following page…
© 2009 Fairchild Semiconductor Corporation
FSEZ1016A Rev. 1.0.1
5
www.fairchildsemi.com

5 Page

FSEZ1016A arduino
Functional Description
Figure 1 shows the basic circuit diagram of a primary-
side regulated flyback converter, with typical waveforms
shown in Figure 25. Generally, discontinuous
conduction mode (DCM) operation is preferred for
primary-side regulation because it allows better output
regulation. The operation principles of DCM flyback
converter are as follows:
During the MOSFET ON time (tON), input voltage (VDL) is
applied across the primary-side inductor (Lm). Then
MOSFET current (Ids) increases linearly from zero to the
peak value (Ipk). During this time, the energy is drawn
from the input and stored in the inductor.
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 (VO),
together with diode forward-voltage drop (VF), are
applied across the secondary-side inductor (Lm×Ns2/
Np2) and the diode current (ID) decreases linearly from
the peak value (Ipk× Np/Ns) to zero. At the end of
inductor current discharge time (tDIS), all the energy
stored in the inductor has been delivered to the output.
When the diode current reaches zero, the transformer
auxiliary winding voltage (VW) begins to oscillate by the
resonance between the primary-side inductor (Lm) 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 (VO+VF)×
NA/NS. 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. 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
www.DataShveoeltta4Uge.comregulation (EA_V) compares the sampled
voltage with internal precise reference to generate error
voltage (VCOMV), 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 the same as the average of
the diode current in steady state.
The output current estimator detects the peak value of
the drain current by a peak detection circuit and
calculates the output current by the inductor discharge
time (tDIS) and switching period (tS). This output
information is compared with the internal precise
reference to generate error voltage (VCOMI), which
determines the duty cycle of the MOSFET in CC mode.
With
Fairchild’s
innovative
technique
TRUECURRENT™, constant current (CC) output can
be precisely controlled.
Of the two error voltages, VCOMV and VCOMI, the smaller
determines the duty cycle. During constant voltage
regulation mode, VCOMV determines the duty cycle while
VCOMI is saturated to HIGH. During constant current
regulation mode, VCOMI determines the duty cycle while
VCOMV is saturated to HIGH.
VAC
+
V DL
-
Np:Ns
ID
D
Lm + VF -
IO
+
L
VO
O
A
D
-
EA_I
EstimIOator
VCOMI Ref
PWM
Control
DetteDcIStor
V COMV
EA_V
EstVimOator
Ref
Primary-Side Regulation
Controller
CS
RCS
VS
VDD
RS1
RS2
Ids
NA
+
Vw
-
Figure 24. Simplified PSR Flyback Converter Circuit
Ids (MOSFET Drain-to-Source Current)
I pk
ID (Diode Current)
I
pk
NP
NS
V (Auxiliary Winding Voltage)
W
VF
NA
NS
VO
NA
NS
I D.avg = I o
t
ON
t
DIS
tS
Figure 25. Key Waveforms of DCM Flyback
Converter
© 2009 Fairchild Semiconductor Corporation
FSEZ1016A Rev. 1.0.1
10
www.fairchildsemi.com

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