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PDF FAN7602C Data sheet ( Hoja de datos )
| Número de pieza | FAN7602C | |
| Descripción | Green Current Mode PWM Controller | |
| Fabricantes | Fairchild Semiconductor | |
| Logotipo |  |
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April 2009
FAN7602C
Green Current Mode PWM Controller
Features
Green Current Mode PWM Controller
Random Frequency Fluctuation for Low EMI
Internal High-Voltage Startup Switch
Burst Mode Operation
Line Voltage Feedforward to Limit Maximum Power
Line Under-Voltage Protection
Latch Protection & Internal Soft-Start (10ms) Function
Overload Protection
Over-Voltage Protection
Over-Temperature Protection
Low Operation Current: 1mA Typical
8-Pin DIP/SOP
Applications
Adapter
LCD Monitor Power
Auxiliary Power Supply
Description
The FAN7602C is a green current-mode PWM controller.
It is specially designed for off-line adapter applications;
DVDP, VCR, LCD monitor applications; and auxiliary
power supplies.
The internal high-voltage startup switch and the burst
mode operation reduce the power loss in standby mode.
As a result, the input power is lower than 1W when the
input line voltage is 265VAC and the load is 0.5W. At no-
load condition, input power is under 0.15W.
The maximum power can be limited constantly,
regardless of the line voltage change, using the power
limit function.
The switching frequency is not fixed and it has random
frequency fluctuation.
The FAN7602C includes various protections for the
system reliability and the internal soft-start prevents the
output voltage over-shoot at startup.
Related Resources
AN-6014- Green Current Mode PWM Controller
(Except for frequency fluctuation part in AN-6014)
Ordering Information
Part Number
FAN7602CN
FAN7602CM
FAN7602CMX
Operating Junction
Temperature
-40°C to +150°C
Eco Status
RoHS
Package
8-DIP
8-SOP
Packing
Method
Rail
Rail
Tape and Reel
Top Mark
FAN7602C
FAN7602C
FAN7602C
For Fairchild’s definition of Eco Status, please visit: http://www.fairchildsemi.com/company/green/rohs_green.html.
© 2009 Fairchild Semiconductor Corporation
FAN7602C • Rev. 1.0.0
www.DataSheet.in
www.fairchildsemi.com
1 page  
Electrical Characteristics
VCC = 14V, TA = -25°C~125°C, unless otherwise specified.
Symbol
Parameter
Condition
Startup Section
ISTR VSTR Startup Current
VSTR = 30V, TA = 25°C
Under Voltage Lock Out Section
Vth(start) Start Threshold Voltage
VCC Increasing
Vth(stop) Stop Threshold Voltage
VCC Decreasing
HY(uvlo) UVLO Hysteresis
Supply Current Section
IST Startup Supply Current
ICC Operating Supply Current
Soft-Start Section
tSS Soft-Start Time(2)
PWM Section
fOSC
ᅀfOSC
Operating Frequency
Frequency Fluctuation(2)
VCS/FB1
tD
CS/FB Threshold Voltage
Propagation Delay to Output(2)
DMAX Maximum Duty Cycle
DMIN
Minimum Duty Cycle
Burst Mode Section
VCS/FB2 Burst On Threshold Voltage
VCS/FB3 Burst Off Threshold Voltage
Power Limit Section
KPlimit
Offset Gain
Output Section
VOH Output Voltage High
VOL Output Voltage Low
tR Rising Time(2)
tF Falling Time(2)
TA = 25°C
Output Not Switching
VCS/FB = 0.2V, TA = 25°C
TA = 25°C
TA = 25°C
TA = 25°C
VLatch/Plimit = 2V, TA = 25°C
TA = 25°C, Isource = 100mA
TA = 25°C, Isink = 100mA
TA = 25°C, CL = 1nF
TA = 25°C, CL= 1nF
Min. Typ. Max. Unit
0.7 1.0 1.4
mA
11 12 13
789
3.6 4.0 4.4
V
V
V
250 320
1.0 1.5
µA
mA
5 10 15 ms
59 65 73
±3
0.9 1.0 1.1
100 150
70 75 80
0
kHz
kHz
V
ns
%
%
0.84 0.95 1.06
0.77 0.88 0.99
V
V
0.12 0.16 0.20
11.5 12.0 14.0
1.0 2.5
45 150
35 150
V
V
ns
ns
Continued on the following page…
© 2009 Fairchild Semiconductor Corporation
FAN7602C • Rev. 1.0.0
www.DataSheet.in
5
www.fairchildsemi.com
5 Page 
To limit the output power of the converter constantly, the
power limit function is included in FAN7602C. Sensing
the converter input voltage through the Latch/Plimit pin,
the Plimit offset voltage is subtracted from 1V. As shown
in Figure 22, the Plimit offset voltage is subtracted from
1V and the switch on-time decreases as the Plimit offset
voltage increases. If the converter input voltage
increases, the switch on-time decreases, keeping the
output power constant. The offset voltage is proportional
to the Latch/Plimit pin voltage and the gain is 0.16. If the
Latch/Plimit voltage is 1V, the offset voltage is 0.16V.
1V
PWM+
Power Limit
Offset
CS/FB
FB
Offset
5.1 Overload Protection (OLP)
The FAN7602C contains the overload protection
function. If the output load is higher than the rated
output current, the output voltage drops and the
feedback error amplifier is saturated. The offset of the
CS/FB voltage representing the feedback information is
almost zero. As shown in Figure 24, the CS/FB voltage
is compared with 50mV reference when the internal
clock signal is HIGH and, if the voltage is lower than
50mV, the OLP timer starts counting. If the OLP
condition persists for 22ms, the timer generates the OLP
signal. The protection is reset by the UVLO. The OLP
block is enabled after the soft-start finishes.
GND
1V
PWM+
CS/FB
On Time
(a) Low Power Limit Offset Case
Power Limit
Offset
FB
Offset
GND
On Time
(b) High Power Limit Offset Case
Figure 22. CS/FB Pin Voltage Waveforms
Figure 24. Overload Protection Circuit
5.2 Line Under-Voltage Protection
If the input voltage of the converter is lower than the
minimum operating voltage, the converter input current
increases too much, causing components failure.
Therefore, if the input voltage is LOW, the converter
should be protected. The LUVP circuit senses the input
voltage using the LUVP pin and, if this voltage is lower
than 2V, the LUVP signal is generated. The comparator
has 0.5V hysteresis. If the LUVP signal is generated, the
output drive block is shut down, the output voltage
feedback loop is saturated, and the OLP works if the
LUVP condition persists more than 22ms.
4. Burst Mode Block
The FAN7602C contains the burst-mode block to reduce
the power loss at a light load and no load. A hysteresis
comparator senses the offset voltage of the Burst+ for
the burst mode, as shown in Figure 23. The Burst+ is
the sum of the CS/FB voltage and Plimit offset voltage.
The FAN7602C enters the burst mode when the offset
voltage of the Burst+ is higher than 0.95V and exits the
burst mode when the offset voltage is lower than 0.88V.
The offset voltage is sensed during the switch off time.
+
−
Figure 23. Burst Mode Block
5. Protection Block
The FAN7602C contains several protection functions to
improve system reliability.
−
+
Figure 25. Line UVP Circuit
5.3 Latch Protection
The latch protection is provided to protect the system
against abnormal conditions using the Latch/Plimit pin.
The Latch/Plimit pin can be used for the output over-
voltage protection and/or other protections. If the Latch/
Plimit pin voltage is made higher than 4V by an external
circuit, the IC is shut down. The latch protection is reset
when the VCC voltage is lower than 5V.
5.4 Over-Voltage Protection (OVP)
If the VCC voltage reaches 19V, the IC shuts down and
the OVP protection is reset when the VCC voltage is
lower than 5V.
6. Output Drive Block
The FAN7602C contains a single totem-pole output
stage to drive a power MOSFET. The drive output is
capable of up to 450mA sourcing current and 600mA
sinking current with typical rise and fall time of 45ns and
35ns, respectively, with a 1nF load.
© 2009 Fairchild Semiconductor Corporation
FAN7602C • Rev. 1.0.0
11
www.fairchildsemi.com
www.DataSheet.in
11 Page | ||
| Páginas | Total 19 Páginas | |
| PDF Descargar | [ Datasheet FAN7602C.PDF ] | |
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