LT1072IT Datasheet, PDF (3/16 Pages) Linear Technology – Available in MiniDiP, TO-220, and TO-3 Packages

LT1072
ELECTRICAL CHARACTERISTICS The ● denotes specifications which apply over the full operating
temperature range. Unless otherwise specified, V_IN = 15V, V_C = 0.5V, V_FB = V_REF, output pin open.
SYMBOL PARAMETER
V_REF
Reference Voltage
I_B
Feedback Input Current
gm
Error Amplifier
Transconductance
Error Amplifier Source or
Sink Current
Error Amplifier Clamp
Voltage
Reference Voltage Line
Regulation
A_V
Error Amplifier Voltage Gain
Minimum Input Voltage
I_Q
Supply Current
Control Pin Threshold
Normal/Flyback Threshold on Feedback Pin
V_FB
Flyback Reference Voltage
Change in Flyback Reference Voltage
Flyback Reference Voltage
Line Regulation
Flyback Amplifier Transconductance (gm)
Flyback Amplifier Source
and Sink Current
BV
Output Switch Breakdown
Voltage
V_SAT
Output Switch ON Resistance (Note 2)
Control Voltage to Switch Current Transconductance
I_LIM
Switch Current Limit
∆I_IN
Supply Current Increase
∆I_SW
During Switch ON Time
f
Switching Frequency
DC (max)
Maximum Switch Duty Cycle
Flyback Sense Delay Time
Shutdown Mode
Supply Current
Shutdown Mode
Threshold Voltage
CONDITlONS
Measured at Feedback Pin
V_C = 0.8V
V_FB = V_REF
∆I_C = ±25µA
V_C = 1.5V
Hi Clamp, V_FB = 1V
Lo Clamp, V_FB = 1.5V
3V ≤ V_IN ≤ V_MAX
V_C = 0.8V
0.9V ≤ V_C ≤ 1.4V
3V ≤ V_IN ≤ V_MAX, V_C = 0.6V
Duty Cycle = 0
l_FB = 50µA
0.05 ≤ I_FB ≤ 1mA
l_FB = 50µA
3V ≤ V_IN ≤ V_MAX (Note 4)
∆I_C = ±10µA
V_C = 0.6V Source
I_FB = 50µA Sink
3V ≤ V_IN ≤ V_MAX
I_SW = 1.5mA
I_SW = 1.25A
LT1072
LT1072HV
LT1072S8
Duty Cycle = 50%
T_J ≥ 25°C
Duty Cycle = 50%
T_J < 25°C
Duty Cycle = 80% (Note 3)
MIN TYP MAX
1.224 1.244 1.264
● 1.214 1.244 1.274
350 750
●
1100
3000 4400 6000
● 2400
7000
150 200 350
● 120
400
1.8
2.3
0.25 0.38 0.52
●
0.03
500 800
●
2.6 3.0
6
9
0.8 0.9 1.08
● 0.6
1.25
0.4 0.45 0.54
15 16.3 17.6
● 14
18
4.5 6.8 8.5
0.01 0.03
150 300 650
● 15 32 70
● 25 40 70
● 65 90
● 75 90
● 60 80
●
0.6 1
2
● 1.25
3
● 1.25
3.5
●
1
2.5
25 35
3V ≤ V_IN ≤ V_MAX
V_C = 0.05V
3V ≤ V_IN ≤ V_MAX
35 40 45
● 33
47
90 92 97
1.5
100 250
100 150 250
● 50
300
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: Measured with V_C in hi clamp, V_FB = 0.8V.
Note 3: For duty cycles (DC) between 50% and 80%, minimum
guaranteed switch current is given by I_LIM = 0.833 (2 – DC).
Note 4: V_MAX = 55V for LT1072HV to avoid switch breakdown.
UNITS
V
V
nA
nA
µmho
µmho
µA
µA
V
V
%/V
%/V
V/V
V
mA
V
V
V
V
V
V
%/V
%/V
µmho
µA
µA
V
V
V
Ω
A/V
A
A
A
mA/A
kHz
kHz
%
µs
µA
mV
mV
1072fc
3