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LT1246CS8#PBF

P1-P3P4-P6P7-P9P10-P12
LT1246/LT1247
4
CCHARA TERIST
ICS
UW
AT
Y
P
I
CA
LPER
F
O
R
C
E
LT1246 Undervoltage Lockout LT1247 Undervoltage Lockout Start-Up Current
Oscillator Sink Current Reference Short-Circuit Current Reference Voltage
TEMPERATURE (°C)
–50
9
V
CC
(V)
10
11
16
17
–25 25 75 125
LT1246 • TPC01
0 50 100
MINIMUM OPERATING VOLTAGE
START-UP THRESHOLD
15
TEMPERATURE (°C)
–50
6
V
CC
(V)
7
8
9
10
11
–25 25 75 125
1247 TPC02
0 50 100
MINIMUM OPERATING VOLTAGE
START-UP THRESHOLD
TEMPERATURE (°C)
–50
0
START-UP CURRENT (µA)
40
80
120
160
200
–25 25 75 125
LT1246 • TPC03
0 50 100
180
140
100
60
20
TEMPERATURE (°C)
–50
–10
FREQUENCY CHANGE (%)
–6
–2
2
6
10
–25 25 75 125
LT1246 • TPC06
0 50 100
–8
–4
0
4
8
V
CC
= 15V
Start-Up Current Supply Current Oscillator Frequency
TEMPERATURE (°C)
–50
10
I
CC
(mA)
11
12
13
14
15
–25 25 75 125
LT1246 • TPC05
0 50 100
V
CC
= 15V
R
T
= 10k
C
T
= 3300pF
V
CC
(V)
0
0
START-UP CURRENT (µA)
50
100
150
200
2 8 12 18
1246/7 TPC04
410146 16
LT1246LT1247
T
J
= 25°C
START-UP
THRESHOLD
TEMPERATURE (°C)
–50
7.7
OSCILLATOR SINK CURRENT (mA)
8.7
–25 25 75 125
LT1246 • TPC07
0 50 100
7.8
8.0
8.2
8.4
8.6
8.5
7.9
8.1
8.3
V
PIN 4
= 2V
TEMPERATURE (°C)
–50
20
REFERENCE SHORT-CIRCUIT CURRENT (mA)
140
–25 25 75 125
LT1246 • TPC08
0 50 100
40
80
100
120
60
TEMPERATURE (°C)
–50
4.95
REFERENCE VOLTAGE (V)
5.05
–25 25 75 125
LT1246 • TPC09
0 50 100
4.96
5.00
5.01
4.97
4.98
4.99
5.02
5.03
5.04
I
O
= 1mA
5
LT1246/LT1247
CCHARA TERIST
ICS
UW
AT
Y
P
I
CA
LPER
F
O
R
C
E
High Level Output
Feedback Pin Input Voltage Current Sense Clamp Voltage Saturation Voltage
Low Level Output Low Level Output Saturation Voltage Supply Current vs
Saturation Voltage During Undervoltage Lockout Oscillator Frequency
OUTPUT SOURCE CURRENT (mA)
0
0
OUTPUT SATURATION VOLTAGE (V)
4.0
200
LT1246 • TPC12
0.5
2.0
2.5
1.0
1.5
3.0
3.5
T
J
= –55°C
T
J
= 25°C
T
J
= 125°C
100
Error Amplifier Open-Loop Gain
and Phase
Current Sense Input Threshold
TEMPERATURE (°C)
–50
2.45
FEEDBACK PIN INPUT VOLTAGE (V)
2.55
–25 25 75 125
LT1246 • TPC10
0 50 100
2.46
2.50
2.51
2.47
2.48
2.49
2.52
2.53
2.54
TEMPERATURE (°C)
–50
0.95
CURRENT SENSE CLAMP VOLTAGE (V)
1.05
–25 25 75 125
LT1246 • TPC11
0 50 100
0.96
1.00
1.01
0.97
0.98
0.99
1.02
1.03
1.04
OSCILLATOR FREQUENCY (Hz)
10k
9
SUPPLY CURRENT (mA)
10
13
14
100k 1M
LT1246 • TPC15
12
11
OUTPUT SINK CURRENT (mA)
0
0
OUTPUT SATURATION VOLTAGE (V)
4.0
510
LT1246 • TPC14
2.0
0.5
1.0
1.5
2.5
3.0
3.5
T
J
= 125°C
T
J
= –55°C
T
J
= 25°C
OUTPUT SINK CURRENT (mA)
0
0
OUTPUT SATURATION VOLTAGE (V)
1.0
100 200
LT1246 • TPC13
T
J
= –55°C
T
J
= 25°C
T
J
= 125°C
0.5
FREQUENCY (Hz)
10
–20
A
VOL
, OPEN LOOP VOLTAGE GAIN (dB)
100
10k 10M
LT1246 • TPC16
40
0
20
60
80
100 1k 100k 1M
PHASE
GAIN
PHASE (DEGREES)
180
–45
225
90
0
45
135
ERROR AMP OUTPUT VOLTAGE (V)
0
0
CURRENT SENSE INPUT THRESHOLD (V)
1.2
36
LT1246 • TPC17
0.6
0.2
0.4
0.8
1.0
12 45
T
J
= –55°C
T
J
= 25°C
T
J
=125°C
LT1246/LT1247
6
CCHARA TERIST
ICS
UW
AT
Y
P
I
CA
LPER
F
O
R
C
E
Timing Resistor vs
Oscillator Frequency
I
SENSE
(Pin 3): Current Sense. This is the input to the
current sense comparator. The trip point of the compara-
tor is set by, and is proportional to, the output voltage of
the Error Amplifier.
R
T
/C
T
(Pin 4) : The oscillator frequency and the deadtime
are set by connecting a resistor (R
T
) from V
REF
to R
T
/C
T
and a capacitor (C
T
) from R
T
/C
T
to GND.
The rise time of the oscillator waveform is set by the RC
time constant of R
T
and C
T
. The fall time, which is equal to
the output deadtime, is set by a combination of the RC time
constant and the oscillator sink current (8.2mA typ.).
COMP (Pin 1): Compensation Pin. This pin is the output of
the Error Amplifier and is made available for loop compen-
sation. It can also be used to adjust the maximum value of
the current sense clamp voltage to less than 1V. This pin
can source a minimum of 0.5mA (0.8mA typ.) and sink a
minimum of 2mA (4mA typ.)
FB (Pin 2): Voltage Feedback. This pin is the inverting
input of the Error Amplifier. The output voltage is normally
fed back to this pin through a resistive divider. The
noninverting input of the Error Amplifier is internally
committed to a 2.5V reference point.
PI
U
FU
U
C
U
S
O
TI
OSCILLATOR FREQUENCY (Hz)
10k
1
TIMING RESISTOR (kΩ)
10
100
100k 1M
LT1246 • TPC19
5nF
2nF
100pF
C
T
=10nF
1nF
V
CC
= 15V
T
J
= 25°C
500pF
200pF
OUTPUT VOLTAGE
V
CC
= 15V TIME 50ns/DIV
C
L
= 1nF 1246/7 G20
V
CC
= 15V TIME 50ns/DIV
C
L
= 1nF 1246/7 G21
CURRENT SENSE
INPUT 1V/DIV
OUTPUT
VOLTAGE 5V/DIV
Output Rise and Fall Time Current Sense Delay Output Cross-Conduction
OUTPUT
VOLTAGE
5V/DIV
OUTPUT CROSS-
CONDUCTION CURRENT
20mA/DIV
V
CC
= 15V TIME 50ns/DIV
C
L
= 15pF 1246/7 G22
Output Deadtime vs
Oscillator Frequency
OSCILLATOR FREQUENCY (kHz)
0
0
DEADTIME (%)
10
20
30
40
50
60
100 1000
LT1246 • TPC18*
5nF 2nF 1nF
100pF
500pF
P1-P3P4-P6P7-P9P10-P12

LT1246CS8#PBF

Mfr. #:
Buy LT1246CS8#PBF
Manufacturer:
Analog Devices / Linear Technology
Description:
Switching Controllers 1MHz Off-Line C Mode PWM & DC/DC Conv
Lifecycle:
New from this manufacturer.
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