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PDF FSEZ1216 Data sheet ( Hoja de datos )
| Número de pieza | FSEZ1216 | |
| Descripción | Primary-Side-Regulation PWM Integrated Power MOSFET | |
| Fabricantes | Fairchild Semiconductor | |
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April 2009
FSEZ1216 — Primary-Side-Regulation PWM Integrated
Power MOSFET
Features
Constant-Voltage (CV) and Constant-Current (CC)
Control without Secondary-Feedback Circuitry
Green Mode: Frequency Reduction at Light-Load
Fixed PWM Frequency at 42kHz with Frequency
Hopping to Reduce EMI
Cable Voltage Drop Compensation in CV Mode
Low Startup Current: 10μA
Low Operating Current: 3.5mA
Peak-Current-Mode Control in CV Mode
Cycle-by-Cycle Current Limiting
VDD Over-Voltage Protection with Auto-Restart
VDD Under-Voltage Lockout (UVLO)
Gate Output Maximum Voltage Clamped at 18V
Fixed Over-Temperature Protection with Latch
DIP-8 Package Available
www.DataShAeept4pUl.iccomations
Battery Chargers for Cellular Phones, Cordless
Phones, PDA, Digital Cameras, Power Tools
Replaces Linear Transformer and RCC SMPS
Offline High Brightness (HB) LED Drivers
Description
The primary-side PWM integrated Power MOSFET,
FSEZ1216, significantly simplifies power supply design
that requires CV and CC regulation capabilities.
FSEZ1216 controls the output voltage and current
precisely only with the information in the primary side of
the power supply, not only removing the output current
sensing loss, but also eliminating all secondary
feedback circuitry.
The green-mode function with a low startup current
(10µA) maximizes the light load efficiency so the power
supply can meet stringent standby power regulations.
Compared with conventional secondary side regulation
approach, the FSEZ1216 can reduce total cost,
component count, size, and weight, while
simultaneously increasing efficiency, productivity, and
system reliability.
A typical output CV/CC characteristic envelope is shown
in Figure 1.
Figure 1. Typical Output V-I Characteristic
Ordering Information
Part Number
Operating
Temperature
Range
MOSFET
BVDSS
FSEZ1216NY -40°C to +105°C 600V
MOSFET
RDS.ON
9.3Ω
(Typical)
Eco
Status
Package
Packing
Method
Green 8-Lead, Dual Inline Package (DIP-8) Tube
For Fairchild’s definition of Eco Status, please visit: http://www.fairchildsemi.com/company/green/rohs_green.html.
© 2009 Fairchild Semiconductor Corporation
FSEZ1216 • Rev. 1.0.1
www.fairchildsemi.com
1 page  
Electrical Characteristics
VDD=15V and TA=25°C unless otherwise specified.
Symbol
Parameter
Conditions
Min. Typ. Max. Units
VDD Section
VOP Continuously Operating Voltage
VDD-ON Turn-On Threshold Voltage
VDD-OFF Turn-Off Threshold Voltage
IDD-ST
Startup Current
IDD-OP
Operating Current
IDD-GREEN
VDD-OVP
tD-VDDOVP
Green Mode Operating Supply
Current
VDD Over-Voltage Protection
Level
VDD Over-Voltage Protection
Debounce Time
0< VDD < VDD-ON-0.16V
VDD=20V, fS=fOSC, VVS=2V,
VCS=3V, CL=1nF
VDD=20V, VVS=2.7V,
fS=fOSC-N-MIN, VCS=0V, CL=1nF,
VCOMV=0V
VCS=3V, VVS=2.3V,
fs= fOSC, VVS=2.3V
Oscillator Section
Center Frequency TA=25°C
fOSC
Frequency Frequency
Hopping Range
TA=25°C
tFHR
fOSC-N-MIN
fOSC-CM-MIN
fDV
Frequency Hopping Period
Minimum Frequency at No Load
Minimum Frequency at CCM
Frequency Variation vs. VDD
Deviation
TA=25°C
VVS=2.7V, VCOMV=0V
VVS=2.3V, VCS=0.5V
VDD=10V to 25V
fDT
Frequency Variation vs.
Temperature Deviation
TA=-40°C to +85°C
Voltage-Sense Section
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IVS-UVP
Sink Current for Brownout
Protection
Itc
VBIAS-COMV
IC Compensation Bias Current
Adaptive Bias Voltage
Dominated by VCOMV
Current-Sense Section
tPD
Propagation Delay to GATE
Output
tMIN-N
tMINCC
DSAW
VTH
Minimum On Time at No Load
Minimum On Time in CC Mode
Duty Cycle of SAW Limiter
Threshold Voltage for Current
Limit
RVS=20KΩ
VCOMV=0V, TA=25°C, RVS=20KΩ
VVS=-0.8V, RS=2KΩ, VCOMV=1V
VVS=0V, VCOMV=2V
25 V
15 16 17 V
4.5 5.0 5.5
V
0 1.6 10.0 μA
3.5 5.0 mA
1 2 mA
27 28 29 V
100 250 400 μs
39 42
±1.8 ±2.6
3
550
20
45
±3.6
5
15
KHz
ms
Hz
KHz
%
%
180 μA
9.5 μA
1.4 V
100
1100
400
40
1.3
200
ns
ns
ns
%
V
Continued on following page…
© 2009 Fairchild Semiconductor Corporation
FSEZ1216 • Rev. 1.0.1
5
www.fairchildsemi.com
5 Page 
Cable Voltage Drop Compensation
When it comes to cellular phone charger applications,
the actual battery is located at the end of cable, which
causes, typically, several percent of voltage drop on the
actual battery voltage. FSEZ1216 has a programmable
cable voltage drop compensation, which provides a
constant output voltage at the end of the cable over the
entire load range in CV mode. As load increases, the
voltage drop across the cable is compensated by
increasing the reference voltage of voltage regulation
error amplifier. The amount of compensation is
programmed by the resistor on the COMR pin. The
relationship between the amount of compensation and
the COMR resistor is shown in Figure 26.
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
10 20 30 40 50 60 70 80 90 100
RCOMR (k )
Figure 26. Cable Voltage Drop Compensation
Switching Frequen cy
42kHz
Dee p
Green
Mode
Green Mode
Normal Mode
550H z
0.8V
2.8V
V COMV
Figure 27. Switching Frequency in Green Mode
Frequency Hopping
EMI reduction is accomplished by frequency hopping,
which spreads the energy over a wider frequency range
than the bandwidth measured by the EMI test
equipment. FSEZ1216 has an internal frequency
hopping circuit that changes the switching frequency
between 39.4kHz and 44.6kHz with a period of 3ms, as
shown in Figure 28.
Gate Drive Signal
ts
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Temperature Compensation
Built-in temperature compensation provides constant
voltage regulation over wide a range of temperature
variation. This internal compensation current
compensates the forward-voltage drop variation of the
secondary-side rectifier diode.
Green-Mode Operation
The FSEZ1216 uses voltage regulation error amplifier
output (VCOMV) as an indicator of the output load and
modulates the PWM frequency, as shown in Figure 27,
such that the switching frequency decreases as load
decreases. In heavy load conditions, the switching
frequency is fixed at 42KHz. Once VCOMV decreases
below 2.8V, the PWM frequency starts to linearly
decrease from 42KHz to 550Hz to reduce the switching
losses. As VCOMV decreases below 0.8V, the switching
frequency is fixed at 550Hz and FSEZ1216 enters deep
green mode, where the operating current reduces to
1mA, further reducing the standby power consumption.
ts
fs
44.6kHz
42.0kHz
39.4kHz
ts
3ms
Figure 28. Frequency Hopping
t
© 2009 Fairchild Semiconductor Corporation
FSEZ1216 • Rev. 1.0.1
11
www.fairchildsemi.com
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet FSEZ1216.PDF ] | |
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