LT1725CS Linear Technology, LT1725CS Datasheet - Page 3

• Manufacturer Part Number: LT1725CS
• Description: IC CNTRLR ISOLATD FLYBACK 16SOIC
• Manufacturer: Linear Technology
• Type: Flybackr

Specifications of LT1725CS

• Internal Switch(s): No
• Synchronous Rectifier: No
• Number Of Outputs: 1
• Frequency - Switching: 50kHz ~ 250kHz
• Operating Temperature: 0°C ~ 100°C
• Mounting Type: Surface Mount
• Package / Case: 16-SOIC (3.9mm Width)
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Current - Output: -
• Voltage - Output: -
• Voltage - Input: -
• Power - Output: -
• Other names: Q1122680

ELECTRICAL CHARACTERISTICS
Note 1: Absolute Maximum Ratings are those values beyond which the life of
a device may be impaired.
Note 2: Component value range guaranteed by design.
Note 3: The V
proportional in magnitude to each other-guaranteed by design.
temperature range, otherwise specifications are at T
SYMBOL
Gate Output
V
I
t
t
Current Amplifier
V
V
Timing
f
C
t
t
t
R
Load Compensation
UVLO Function
V
I
3V Output Function
V
GATE
r
f
ON
ED
EN
UVLO
GATE
C
ISENSE
OSCAP
UVLO
REF
t
CC
PARAMETER
Output High Level
Output Low Level
Output Sink Current in Shutdown, V
Rise Time
Fall Time
Control Pin Threshold
Switch Current Limit
∆V
Switching Frequency
Oscillator Capacitor Value
Minimum Switch On Time
Flyback Enable Delay Time
Minimum Flyback Enable Time
Timing Resistor Value
Maximum Switch Duty Cycle
Sense Offset Voltage
Current Gain Factor
UVLO Pin Threshold
UVLO Pin Bias Current
Reference Output Voltage
Output Impedance
Current Limit
turn-on/turn-off voltages and hysteresis voltage are
ISENSE
/∆V
C
UVLO
= 0V
A
= 25°C. V
CONDITIONS
I
I
I
I
V
C
C
Duty Cycle = Min
Duty Cycle ≤ 30%
Duty Cycle ≤ 30%
Duty Cycle = 80%
C
(Note 2)
R
R
R
(Note 2)
V
V
I
GATE
GATE
GATE
GATE
LOAD
GATE
L
L
OSCAP
UVLO
UVLO
tON
ENDLY
MENAB
The
= 1000pF
= 1000pF
= 50k
= 100mA
= 500mA
= 100mA
= 500mA
= 1mA
= 2V
= 1.2V
= 1.3V
●
= 100pF
= 50k
= 50k
CC
denotes specifications which apply over the full operating
= 14V, GATE open, V
C
= 1.4V unless otherwise noted.
●
●
●
●
●
●
●
●
●
●
●
●
– 0.25
– 4.50
11.5
11.0
0.90
0.80
0.80
1.21
MIN
220
200
1.2
2.8
90
80
33
24
85
8
+ 0.1
– 3.5
12.1
11.8
1.12
0.30
0.95
1.25
TYP
250
220
100
200
200
200
0.3
0.6
2.5
3.0
30
30
90
10
15
2
+ 0.25
– 2.50
MAX
0.45
1.25
1.35
1.05
1.29
LT1725
270
280
115
125
200
200
1.0
3.2
5
UNITS
1725fa
3
kHz
kHz
mA
mV
mV
mV
mV
mV
mV
mA
kΩ
µA
µA
ns
ns
pF
ns
ns
ns
%
Ω
V
V
V
V
V
V
V
V