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PDF FAN7602 Data sheet ( Hoja de datos )
| Número de pieza | FAN7602 | |
| Descripción | Green Current Mode PWM Controller | |
| Fabricantes | Fairchild Semiconductor | |
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FAN7602
Green Current Mode PWM Controller
November 2006
Features
Green Current Mode PWM Control
Fixed 65kHz Operation with Frequency Modulation
Internal High-Voltage Start-up Switch
Burst Mode Operation
Line Voltage Feed Forward to Limit Maximum Power
Line Under-Voltage Protection
Latch Protection & Internal Soft-Start (10ms) Function
Overload Protection
Over-Voltage Protection
Low Operation Current: Typical 1mA
8-pin DIP/SOP
Applications
Adapter
LCD Monitor Power
Auxiliary Power Supply
Related Application Notes
AN6014 - Green Current Mode PWM Controller
FAN7602
Description
The FAN7602 is a green current mode PWM controller. It
is specially designed for off-line adapter application,
DVDP, VCR, LCD monitor application, and auxiliary
power supplies.
The internal high-voltage start-up switch and the burst-
mode operation reduce the power loss in standby mode.
Because of the internal start-up switch and the burst
mode, it is possible to supply 0.5W load, limiting the
input power to under 1W when the input line voltage is
265VAC. On no-load condition, the input power is under
0.3W.
The maximum power can be limited constantly, regard-
less of the line voltage change, using the power limit
function.
The switching frequency is internally fixed at 65kHz and
the frequency modulation technique reduces EMI.
The FAN7602 includes various protections for the sys-
tem reliability and the internal soft-start prevents the out-
put voltage overshoot at start-up.
Ordering Information
Part Number
FAN7602N
FAN7602M
FAN7602MX
Operating Temp.
Range
Pb-Free
-25°C to +125°C
Yes
Package
8-DIP
8-SOP
Packing Method
Rail
Rail
Tape & Reel
Marking
Code
FAN7602
FAN7602
FAN7602
© 2006 Fairchild Semiconductor Corporation
FAN7602 Rev. 1.0.2
www.fairchildsemi.com
1 page  
Electrical Characteristics
VCC = 14V, TA = -25°C~125°C, unless otherwise specified.
Symbol
Parameter
Condition
START UP SECTION
Istr Vstr Start-up Current
UNDER VOLTAGE LOCK OUT SECTION
Vth(start)
Vth(stop)
HY(uvlo)
Start Threshold Voltage
Stop Threshold Voltage
UVLO Hysteresis
SUPPLY CURRENT SECTION
Vstr = 30V, TA = 25°C
VCC increasing
VCC decreasing
Ist Start-up Supply Current
ICC Operating Supply Current
SOFT-START SECTION
TSS Soft-Start Time(2)
PWM SECTION
FOSC
ΔF
Operating Frequency
Frequency Modulation
VCS/FB1 CS/FB Threshold Voltage
tD Propagation Delay to Output(2)
DMAX Maximum Duty Cycle
DMIN Minimum Duty Cycle
BURST MODE SECTION
TA = 25°C
Output no switching
VCS/FB = 0.2V, TA = 25°C
TA = 25°C
VCS/FB2 Burst On Threshold Voltage
VCS/FB3 Burst Off Threshold Voltage
POWER LIMIT SECTION
TA = 25°C
TA = 25°C
KPlimit Offset Gain
OUTPUT SECTION
VOH Output Voltage High
VOL Output Voltage Low
tr Rising Time(2)
tf Falling Time(2)
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
Note:
2. These parameters, although guaranteed by design, are not tested in production.
Min.
0.7
11
7
3.6
5
59
0.9
70
0.84
0.77
0.12
11.5
Typ. Max. Unit
1 1.4 mA
12 13 V
89V
4 4.4 V
250 320 μA
1 1.5 mA
10 15 ms
65 73 kHz
±2 kHz
1.0 1.1 V
100 150 ns
75 80 %
0%
0.95 1.06
0.88 0.99
V
V
0.16 0.20
12 14 V
1 2.5 V
45 150 ns
35 150 ns
© 2006 Fairchild Semiconductor Corporation
FAN7602 Rev. 1.0.2
5
www.fairchildsemi.com
5 Page 
1V
PWM+
CS/FB
Power Limit
Offset
FB
Offset
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 FAN7602 Rev. 02
Figure 22. CS/FB Pin Voltage Waveforms
4. Burst Mode Block
The FAN7602 contains the burst mode block to reduce
the power loss at a light load and no load as the
FAN7601. A hysteresis comparator senses the offset
voltage of the Burst+ for the burst mode as shown in Fig-
ure 23. The Burst+ is the sum of the CS/FB voltage and
Plimit offset voltage. The FAN7602 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.
D elay
C ircuit
+ Burst+
−
0 .9 5 V /0 .8 8 V
O ffset
3 CS/FB
FAN7602 Rev. 02
Figure 23. Burst Mode Block
5. Protection Block
The FAN7602 contains several protection functions to
improve system reliability.
5.1 Overload Protection
The FAN7602 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 represent-
ing 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. And this protection is
reset by the UVLO. The OLP block is enabled after the
soft-start finishes.
Clock
OLP 22ms
Timer
3 CS/FB
Soft-Start
50mV
FAN7602 Rev. 02
Figure 24. Overload Protection Circuit
5.2 Line Under-Voltage Protection
If the input voltage of the converter is lower than the min-
imum operating voltage, the converter input current
increases too much, causing components failure. There-
fore, if the input voltage is low, the converter should be
protected. In the FAN7602, 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 com-
parator has 0.5V hysteresis. If the LUVP signal is gener-
ated, 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.
Vin
1 − LUVP
+
2V/1.5V
FAN7602 Rev. 02
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 FAN7602 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 cur-
rent with typical rise and fall time of 45ns, 35ns respec-
tively with a 1nF load.
© 2006 Fairchild Semiconductor Corporation
FAN7602 Rev. 1.0.2
11
www.fairchildsemi.com
11 Page | ||
| Páginas | Total 18 Páginas | |
| PDF Descargar | [ Datasheet FAN7602.PDF ] | |
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