FAN2108 Fairchild Semiconductor, FAN2108 Datasheet - Page 5

• Manufacturer Part Number: FAN2108
• Description: This part is covered in Fairchild's href="http://www
• Manufacturer: Fairchild Semiconductor

© 2008 Fairchild Semiconductor Corporation
FAN2108 • Rev. 1.0.1
Electrical Specifications
Electrical specifications are the result of using the circuit shown in Figure 1 unless otherwise noted.
Power Supplies
Oscillator
Reference
Error Amplifier
Protection and Shutdown
Soft-Start
Note:
2.
Symbol
V
I
V
V
V
SOURCE
V
FLT_HYS
T
V
I
T
V
I
t
BW
I
V
COMP
I
I
t
RAMP
SINK
BIAS
t
UVLO
OFF
UVLO
t
ILIM
LIM
ON
G
TSD
HYS
OVP
CC
SS
EN
FLT
Specifications guaranteed by design and characterization; not production tested.
f
FB
V
V
Frequency
Minimum On-Time
Ramp Amplitude, peak-to–peak
Minimum Off-Time
Reference Voltage (see Figure 4 for
Temperature Coefficient)
DC Gain
Gain Bandwidth Product
Output Voltage
Output Current, Sourcing
Output Current, Sinking
FB Bias Current
Current Limit
I
Over-Temperature Shutdown
Over-Temperature Hysteresis
Over-Voltage Threshold
Under-Voltage Shutdown
Fault Discharge Threshold
Fault Discharge Hysteresis
V
Fault Enable/SSOK (T1.0)
LIM
CC
CC
OUT
Current
Current
UVLO Threshold
to Regulation (T0.8)
(2)
Parameter
(2)
(2)
(2)
SW=Open, FB=0.7V, V
f
Shutdown: EN=0, V
Rising V
Hysteresis
R
R
16V
R
FAN2108MPX, 25°C
FAN2108EMPX, 25°C
V
V
V
V
R
Description)
Internal IC Temperature
Two Consecutive Clock Cycles
16 Consecutive Clock Cycles
Measured at FB Pin
Measured at FB Pin (V
Frequency=600KHz
SW
CC
CC
CC
FB
T
T
RAMP
ILIM
=50KΩ
=24KΩ
=600KHz
=0.8V, 25°C
=5V
=5V, V
=5V, V
IN
Open at 25°C (see Circuit
, 1.8V
=200KΩ
5
CC
COMP
COMP
OUT
Conditions
, R
=2.2V
=1.2V
T
=30KΩ,
CC
=5V
FB
CC
~500mV)
=5V,
Min. Typ. Max. Unit
-850
255
540
794
795
110
4.1
0.4
1.5
0.8
-11
80
12
12
68
+155
5.3
6.7
0.53
-650 -450
300
300
600
100
+30
115
250
800
800
250
-10
4.3
2.2
1.2
50
85
15
15
73
8
7
806
805
121
3.2
18
78
345
660
150
-9
4.5
www.fairchildsemi.com
12
10
65
%V
%V
MHz
mV
mV
mA
mA
mV
mV
ms
ms
dB
nA
µA
KHz
KHz
°C
°C
mA
mV
V
A
µA
ns
ns
V
V
OUT
OUT