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PDF FSEZ1216B Datasheet ( Hoja de datos )

Número de pieza FSEZ1216B
Descripción Primary-Side-Regulation PWM Integrated Power MOSFET
Fabricantes Fairchild Semiconductor 
Logotipo Fairchild Semiconductor Logotipo

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FSEZ1216B Hoja de datos, Descripción, Manual
January 2009
FSEZ1216B
Primary-Side-Regulation PWM Integrated Power MOSFET
Features
ƒ Constant-Voltage (CV) and Constant-Current (CC)
Control without Secondary-Feedback Circuitry
ƒ Green-Mode Function: PWM Frequency Linearly
Decreasing
ƒ Fixed PWM Frequency at 50kHz with Frequency
Hopping to Solve EMI Problems
ƒ Cable Compensation in CV mode
ƒ Low Startup Current: 10μA
ƒ Low Operating Current: 3.5mA
ƒ Peak-Current-Mode Control in CV Mode
ƒ Cycle-by-Cycle Current Limiting
ƒ VDD Over-Voltage Protection (OVP) with
Auto-Restart
ƒ VDD Under-Voltage Lockout (UVLO)
ƒ Fixed Over-Temperature Protection (OTP)
with Latch
ƒ DIP-8 Package Available
Description
This highly integrated PWM controller provides several
features to enhance the performance of low-power
flyback converters. The proprietary topology enables
most simplified circuit design especially for battery
charger applications. A low-cost, smaller, and lighter
charger results when compared to a conventional
design or a linear transformer. The startup current is
only 10μA, which allows large startup resistance for
further power saving.
To minimize the standby-power consumption, the
proprietary green-mode function provides off-time
modulation to linearly decrease PWM frequency under
light-load conditions. This green-mode function assists
the power supply in meeting power conservation
requirements.
By using FSEZ1216B, a charger can be implemented
with few external components and minimized cost. A
typical output CV/CC characteristic envelope is shown
in Figure 1.
FSEZ1216B series controllers are available in an 8-pin
DIP package.
Applications
www.DataShƒeet4BUa.ctotemry Chargers for Cellular Phones, Cordless
Phones, PDA, Digital Cameras, Power Tools
ƒ Best Choice to Replace Linear Transformer and
RCC SMPS
Figure 1. Typical Output V-I Characteristic
Ordering Information
Part Number
FSEZ1216BNY
Operating
Temperature Range
-40°C to +105°C
Eco
Status
Green
Package
8-Lead, Dual Inline Package (DIP-8)
Packing
Method
Tube
For Fairchild’s definition of “green” Eco Status, please visit: http://www.fairchildsemi.com/company/green/rohs_green.html.
© 2008 Fairchild Semiconductor Corporation
FSEZ1216B Rev. 1.0.0
www.fairchildsemi.com

1 page

FSEZ1216B pdf
Electrical Characteristics
VDD=15V, TA=25°C, unless otherwise specified.
Symbol
Parameter
Conditions
VDD SECTION
VOP
VDD-ON
VDD-OFF
IDD-ST
IDD-OP
IDD-GREEN
VDD-OVP
Continuously Operating Voltage
Turn-On Threshold Voltage
Turn-Off Threshold Voltage
Startup Current
Operating Current
Green-Mode Operating Supply
Current
VDD Over-Voltage-Protection
Level
0<VDD<VDD-ON-0.16V
VDD=20V, fS=fOSC,
VVS=2V, VCS=3V,
CL=1nF
VDD=20V, VVS=2.7V
VCS=0V, VCOMV=0V
fS=fOSC-N-MIN, CL=1nF
VVS=2.3V, VCS=3V
tD-VDDOVP
VDD Over-Voltage-Protection
Debounce Time
fS=fOSC, VVS=2.3V
OSCILLATOR SECTION
Center
Frequency
TA=25°C, VVS=2.3V
fOSC
Frequency
Frequency-
Hopping Range
VCS=1.5V, VVS=2V
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
VCS=1.5V, VVS=2V
VVS=2.7V, VCOMV=0V
VVS=2.3V, VCS=0.5V
VDD=10V to 25V
fDT
Frequency Variation vs.
Temperature Deviation
www.DataShVeOet4LUT.cAoGmE-SENSE SECTION
TA=-40°C to 105°C
IVS-UVP
Sink Current for Brownout
Protection
RVS=20K
Itc
VBIAS-COMV
IC Compensation Bias Current
Adaptive Bias Voltage
Dominated by VCOMV
VCOMV=0V,RVS=20K
Min.
15
4.5
27
100
48
±1.0
Typ.
16
5.0
10
3.5
1
28
250
50
±1.5
2.56
500
18
125
9.5
1.4
Max.
25
17
5.5
20
5.0
2
29
400
55
±2.3
5
15
Units
V
V
V
μA
mA
mA
V
μs
KHz
ms
Hz
KHz
%
%
μA
μA
V
© 2008 Fairchild Semiconductor Corporation
FSEZ1216B Rev. 1.0.0
5
www.fairchildsemi.com

5 Page

FSEZ1216B arduino
Functional Description
The proprietary topology of FSEZ1216B enables most
simplified circuit design especially for battery charger
applications. Without secondary feedback circuitry, the
CV and CC control can still be achieved accurately. As
shown in Figure 24, with the frequency-hopping, PWM
operation, EMI problem can be solved by using
minimized filter components. FSEZ1216B also provides
many protection functions. The VDD pin is equipped
with over-voltage protection (OVP) and under-voltage
lockout (UVLO). Pulse-by-pulse current limiting and CC
control ensure over-current protection (OCP) at heavy
loads. The GATE output is clamped at 15V to protect
the external MOSFET from over-voltage damage. Also,
the internal over-temperature-protection (OTP) function
shuts down the controller with latch when over heated.
Figure 24. Frequency Hopping
Startup Current
The startup current is only 10μA. Low startup current
allows a startup resistor with a high resistance and a low
wattage to supply the starup power for the controller. A
1.5M, 0.25W, startup resistor and a 10μF/25V VDD
hold-up capacitor is sufficient for an AC-to-DC power
www.DataShaedeat4pUte.crowmith a wide input range (100VAC to 240VAC).
Operating Current
The operating current has been reduced to 3.5mA. The
low operating current results in higher efficiency and
reduces the VDD hold-up capacitance requirement. Once
FSEZ1216B enters deep-green mode, the operating
current is reduced to 1mA, assisting the power supply to
easily meet the power conservation requirement.
Green-Mode Operation
Figure 25 shows the characteristics of the PWM
frequency vs. the output voltage of the error amplifier
(VCOMV). The FSEZ1216B uses the positive,
proportional, output load parameter (VCOMV) as an
indication of the output load for modulating the PWM
frequency. In heavy-load conditions, the PWM
frequency is fixed at 50KHz. Once VCOMV is lower than
VN, the PWM frequency starts to linearly decrease from
50KHz to 500Hz, thus providing further power savings
and easily meeting international power-conservation
requirements.
Figure 25. Green-Mode Operation Frequency
vs. VCOMV
Constant Voltage (CV) and Constant
Current (CC) Operation
An innovative technique of the FSEZ1216B can
accurately achieve CV/CC characteristic output without
secondary-side voltage or current-feedback circuitry.
There is a feedback signal from the reflected voltage
across the primary auxiliary winding for CV/CC
operation. This voltage signal is proportional to
secondary winding, so it provides the controller the
feedback signal from secondary side and achieves
constant-voltage-output property. In constant-current-
output operation, this voltage signal is detected and
examined by the precise constant-current-regulation
controller, then determines the on-time of the MOSFET
to control input power and provide constant-current-
output property. With feedback voltage VCS across the
current-sense resistor, the controller can obtain the
input power of the power supply. Therefore, the region
of constant-current-output operation can be adjusted by
the current sense resistor.
Temperature Compensation
The FSEZ1216B has built-in temperature
compensation, in order to get better CV regulation at
different ambient temperatures. This internal
compensation current is a positive-temperature-
coefficient (PTC) current that can compensate the
forward-voltage drop of the secondary diode varying
with temperature. This variation causes output-voltage
rising at high temperature.
Leading-Edge Blanking (LEB)
Each time the power MOSFET is switched on, a turn-on
spike occurs at the sense resistor. To avoid premature
termination of the switching pulse, a leading-edge
blanking time is built in. Conventional RC filtering can
therefore be omitted. During this blanking period, the
current-limit comparator is disabled and it cannot switch
off the gate driver.
© 2008 Fairchild Semiconductor Corporation
FSEZ1216B Rev. 1.0.0
11
www.fairchildsemi.com

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