LT3837EFE-PBF LINER [Linear Technology], LT3837EFE-PBF Datasheet - Page 3

• Manufacturer Part Number: LT3837EFE-PBF
• Description: Isolated No-Opto Synchronous Flyback Controller
• Manufacturer: LINER [Linear Technology]

ELECTRICAL CHARACTERISTICS
temperature range, otherwise specifi cations are T
R
PARAMETER
Feedback Amplifi er Voltage Gain
Soft-Start Charging Current
Soft-Start Discharge Current
Control Pin Threshold (V
Gate Outputs
PG, SG Output High Level
PG, SG Output Low Level
PG, SG Output Shutdown Strength
PG Rise Time
SG Rise Time
PG, SG Fall Time
Current Amplifi er
Switch Current Limit at Maximum V
ΔV
Sense Voltage Overcurrent Fault Voltage
Timing
Switching Frequency (f
Oscillator Capacitor Value (C
Minimum Switch On Time (t
Flyback Enable Delay Time (t
PG Turn-On Delay Time (t
Maximum Switch Duty Cycle
SYNC Pin Threshold
SYNC Pin Input Resistance
Load Compensation
Load Comp to V
Feedback Pin Load Compensation Current
UVLO Function
UVLO Pin Threshold (V
UVLO Pin Bias Current
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2: This IC includes overtemperature protection that is intended
to protect the device during momentary overload conditions. Junction
temperature will exceed 125°C when overtemperature protection is active.
Continuous operation above the specifi ed maximum operating junction
temperature may impair device reliability.
PGDLY
SENSE
= 27.4k, R
/ΔV
C
SENSE
ENDLY
Offset Voltage
OSC
UVLO
C
PGDLY
)
)
= 90k, unless otherwise specifi ed.
)
ON(MIN)
OSC
ED
)
)
)
)
C
A
= 25°C. V
CONDITIONS
V
V
V
Duty Cycle = Min
V
C
C
C
V
V
C
(Note 6)
V
V
V
V
C
SFST
SFST
UVLO
PG
SG
PG
SENSE
SENSE
OSC
RCMP
SENSE
UVLO
UVLO
= 1V to 2V
The
, C
= 1nF
= 1nF
= 100pF
CC
= 1.5V
= 1.5V, V
SG
= 0V; I
= 1.2V
= 1.3V
+ = 20mV
with V
+
+, V
l
= 14V; PG, SG Open; V
= 1nF
denotes specifi cations which apply over the full operating
SFST
PG
SENSE+
UVLO
, I
Note 3: The LT3837E is guaranteed to meet performance specifi cations
from 0°C to 85°C. Specifi cations over the –40°C to 125°C operating
junction temperature range are assured by design, characterization and
correlation with statistical process controls.
Note 4: T
dissipation PD according to the following formula:
Note 5: Supply current does not include gate charge current to the
MOSFETs. See Applications Information.
Note 6: Component value range guaranteed by design.
< 1V
SG
T
= 0V
= 20mA
= 0
J
= T
J
A
is calculated from the ambient temperature T
+ (P
D
• 40°C/W)
C
= 1.4V, V
l
l
l
l
l
l
l
l
SENSE
1.215
–0.25
–4.50
MIN
0.7
6.6
16
88
84
33
85
= 0, R
CMP
1.240
1400
0.01
0.07
1.53
–3.4
TYP
206
100
200
265
200
1.3
1.0
7.4
1.6
0.8
0.1
20
11
15
10
98
88
40
20
= 1k, R
A
LT3837
1.265
–2.50
and power
MAX
0.05
0.25
110
230
110
200
8.0
2.3
2.1
TON
25
= 90k,
UNITS
3837fa
3
kHz
V/V
V/V
mA
mV
mV
mV
kΩ
μA
μA
μA
μA
ns
ns
ns
pF
ns
ns
ns
%
V
V
V
V
V
V