LTC3803-5 Linear Technology, LTC3803-5 Datasheet - Page 3

• Manufacturer Part Number: LTC3803-5
• Description: Constant Frequency Current Mode Flyback DC/DC Controller
• Manufacturer: Linear Technology

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Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: The LTC3803H-5 is guaranteed to meet specifications from –40°C
to 150°C. The LTC3803E-5 is guaranteed to meet specifications from 0°C
to 85°C with specifications over the –40°C to 85°C temperature range
assured by design, characterization and correlation with statistical process
controls.
Junction temperature (T
and the power dissipation P
Note 3: High junction temperatures degrade operating lifetimes. Operating
ELECTRICAL CHARACTERISTICS
SYMBOL
V
V
V
V
V
I
V
I
V
g
∆V
∆V
I
f
DC
DC
t
t
V
I
t
to 150°C operating junction temperature range, otherwise specifications are at T
(Notes 2, 3)
CC
ITHSTART
FB
OSC
RISE
FALL
SLMAX
SFST
m
TURNON
TURNOFF
HYST
CLAMP1mA
CLAMP25mA
ITHSHDN
FB
IMAX
O(LINE)
O(LOAD)
ON(MIN)
ON(MAX)
T
J
= T
A
+ (P
PARAMETER
V
V
V
V
V
Input DC Supply Current
Shutdown Threshold (at I
Start-Up Current Source
Regulated Feedback Voltage
Error Amplifier Transconductance
Output Voltage Line Regulation
Output Voltage Load Regulation
V
Oscillator Frequency
Minimum Switch On Duty Cycle
Maximum Switch On Duty Cycle
Gate Drive Rise Time
Gate Drive Fall Time
Peak Current Sense Voltage
Peak Slope Compensation Output Current
Soft-Start Time
D
CC
CC
CC
CC
CC
Normal Operation
Undervoltage
FB
• 230°C/W)
Input Current
Turn On Voltage
Turn Off Voltage
Hysteresis
Shunt Regulator Voltage
Shunt Regulator Voltage
J)
is calculated from the ambient temperature T
D
in the LTC3803-5 using the formula:
TH
/RUN)
CONDITIONS
V
I
I
(Note 4)
V
V
V
V
0°C ≤ T
–40°C ≤ T
I
V
I
I
(Note 5)
V
V
V
C
C
R
(Note 7)
CC
CC
TH/RUN
TH
TH
TURNON
ITH/RUN
CC
CC
ITH/RUN
TURNOFF
ITH/RUN
ITH/RUN
ITH/RUN
LOAD
LOAD
SL
/RUN Sinking 5µA (Note 5)
/RUN Sourcing 5µA (Note 5)
= 1mA, V
= 25mA, V
= V
= V
= 0 (Note 6)
LTC3803H-5: The
= 3000pF
= 3000pF
TURNON
TURNON
J
Pin Load = ±5µA (Note 5)
= 1.3V
= 0V
≤ 85°C (Note 5)
= 1.3V
= 1.3V, V
= 1.3V, V
– V
< V
A
J
≤ 150°C (Note 5)
TURNOFF
ITH/RUN
CC
ITH/RUN
– 100mV
+ 100mV
< V
FB
FB
lifetime at junction temperatures greater than 125°C is derated to 1000
hours.
Note 4: Dynamic supply current is higher due to the gate charge being
delivered at the switching frequency.
Note 5: The LTC3803-5 is tested in a feedback loop that servos V
output of the error amplifier while maintaining I
the current limit range.
Note 6: Peak current sense voltage is reduced dependent on duty cycle
and an optional external resistor in series with the SENSE pin (R
details, refer to the programmable slope compensation feature in the
Applications Information section.
Note 7: Guaranteed by design.
CLAMP
= 0V
= 0.8V
= 0.8V
= 0V
(Note 5)
●
indicates specifications which apply over the full –40°C
A
= 25°C. V
CC
●
●
●
●
●
●
●
●
●
●
= 5V, unless otherwise noted.
0.788
0.780
0.05
0.08
0.07
MIN
200
170
3.9
3.2
6.2
6.3
70
85
0.800
0.800
0.28
0.34
TYP
240
333
200
100
4.8
0.8
8.1
0.1
6.5
0.7
40
10
80
40
40
TH
4
8
3
3
5
LTC3803-5
/RUN at the midpoint of
0.812
0.820
MAX
10.4
10.7
0.45
350
100
500
230
115
5.7
4.9
8.5
50
90
1
SL
FB
). For
to the
mV/µA
mV/µA
UNITS
mV/V
38035f
3
µA/V
kHz
mV
ms
µA
µA
µA
nA
µA
ns
ns
%
%
V
V
V
V
V
V
V
V