LT1952IGN Linear Technology, LT1952IGN Datasheet - Page 3

• Manufacturer Part Number: LT1952IGN
• Description: IC,SMPS CONTROLLER,CURRENT-MODE,SOP,16PIN,PLASTIC
• Manufacturer: Linear Technology

range, otherwise specifications are at T
SD_V
ELECTRICAL CHARACTERISTICS
V
Output Voltage
Line Regulation
Load Regulation
OSCILLATOR
Frequency: f
Minimum Programmable f
Maximum Programmable f
SYNC Input Resistance
SYNC Switching Threshold
SYNC Frequency/f
f
V
ERROR AMPLIFIER
FB Reference Voltage
FB Input Bias Current
Open Loop Voltage Gain
Unity Gain Bandwidth
COMP Source Current
COMP Sink Current
COMP Current (Disabled)
COMP High Level: V
COMP Active Threshold
COMP Low Level: V
CURRENT SENSE
I
I
I
OC Threshold
OC Input Current
Default Blanking Time
Adjustable Blanking Time
V
PARAMETER
OSC
SENSE
SENSE
SENSE
REF
ROSC
BLANK
Line Reg
SEC
Maximum Threshold
Input Current (Duty Cycle = 0%)
Input Current (Duty Cycle = 80%)
= 2V, BLANK = 121k, DELAY = 121k, I
OSC
OSC
OL
OH
OSC
OSC
A
= 25°C. COMP = open, FB = 1.4V, R
SENSE
= 0V, OC = 0V, OUT = 1nF, V
I
I
0µA < I
R
R
R
FB = 1V
FB = 1V (Note 7)
FB = 1V, R
SS_MAXDC = 1.84V
R
10V < V
FB = FB Reference Voltage
V
(Note 6)
FB = 1V, COMP = 1.6V
COMP = 1.6V
FB = V
FB = 1V, I
FB = 1V, SOUT Duty Cycle > 0 %
I
COMP = 2.5V, FB = 1V
COMP = 2.5V, FB = 1V (Note 4)
COMP = 2.5V, FB = 1V (Note 4)
COMP = 2.5V, FB = 1V
(OC = 100mV)
COMP = 2.5V, FB = 1V, R
COMP = 2.5V, FB = 1V, R
CONDITIONS
(VREF)
(VREF)
(COMP)
OL
OSC
OSC
OSC
OSC
+ 0.2V < COMP < V
= 178k, FB = 1V, SS_MAXDC = 1.84V
= 365k, FB = 1V
= 64.9k, COMP = 2.5V, SD_V
Pin voltage
REF
= 0µA
= 0µA, 10V < V
(VREF)
IN
= 250µA
The
, COMP = 1.6V
(COMP)
< 25V, V
OSC
●
< 2.5mA
= 178k; 10V < V
denotes the specifications which apply over the full operating temperature
= –250µA
OL
+ 0.2V < COMP < V
IN
OH
OSC
< 25V
BLANK
BLANK
– 0.2
= 178k, SYNC = 0V, SS_MAXDC = V
IN
IN
= 15V, SOUT = open, unless otherwise specified.
= 40k (Note 10)
= 120k
< 25V,
SEC
= 2.64V
OH
– 0.2
LT1952/LT1952-1
●
●
●
2.425
1.201
MIN
165
440
197
2.7
0.7
80
65
–4
18
98
4
REF
1.226
1.25
0.05
0.15
TYP
200
100
500
–75
220
–35
107
–50
180
540
2.5
1.5
3.2
0.8
18
85
–9
10
23
–8
1
1
1
3
1
, V
REF
= 0.1µF,
2.575
1.250
–200
–100
MAX
0.33
240
120
560
243
116
2.2
1.5
0.4
10
10
28
UNITS
19521fb
3
MHz
%/V
kHz
kHz
kHz
mV
mV
mA
mA
mV
mV
kΩ
nA
dB
µA
µA
µA
nA
ns
ns
V
V
V
V
V
V
V
V