LT1952 Linear Technology, LT1952 Datasheet - Page 2

• Manufacturer Part Number: LT1952
• Description: Single Switch Synchronous Forward Controller
• Manufacturer: Linear Technology

ABSOLUTE AXI U RATI GS
LT1952
(Note 1)
V
SYNC, SS_MAXDC, SD_V
OC, COMP, BLANK, DELAY ......................... –0.3V to 6V
FB ................................................................ –0.3V to 3V
R
V
Operating Junction Temperature Range
Storage Temperature Range ................. – 65°C to 150°C
Lead Temperature (Soldering, 10 sec).................. 300°C
ELECTRICAL CHARACTERISTICS
temperature range, otherwise specifications are at T
= 0.1µF, SD_V
PARAMETER
PWM CONTROLLER
Operational Input Voltage
V
V
V
SD_V
SD_V
SD_V
V
V
V
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
2
OSC
IN
IN
IN
IN ON
IN OFF
IN HYSTERESIS
REF
ROSC
IN
REF
OSC ......................................................................................
(Notes 2, 5) ....................................... –40°C to 125°C
Quiescent Current
Startup Current
Shutdown Current
Line Reg
(Note 8) ............................................... –0.3V to 25V
SEC
SEC (ON)
SEC (OFF)
.................................................................... –10mA
Threshold
OSC
Current
Current
SEC
OSC
= 2V, BLANK = 40k, DELAY = 40k, I
W
OSC
OSC
SEC
W W
, I
SENSE
,
A
CONDITIONS
I
I
FB = 0V, SS_MAXDC = 0V (Notes 4, 9)
SD_V
10V < V
SD_V
SD_V
I
I
0µA < I
R
R
R
FB = 1V
FB = 1V (Note 7)
FB = 1V, R
SS_MAXDC = 1.84V
R
U
SENSE
(VREF)
(VREF)
(VREF)
(VREF)
= 25°C. COMP = open, FB = 1.4V, R
OSC
OSC
OSC
OSC
SEC
SEC
SEC
= 178k, FB = 1V
= 365k
= 64.9k, COMP = 2.5V, SD_V
Pin voltage
= 0V, OC = 0V, OUT = 1nF, V
= 0µA
= 0µA, FB = 0V, I
= 0µA
= 0µA, 10V < V
(VREF)
–50µA
IN
The
= 0V
= SD_V
= SD_V
< 25V
OSC
< 2.5mA
●
= 178k; 10V < V
denotes the specifications which apply over the full operating
SEC
SEC
Threshold + 100mV
Threshold – 100mV
PACKAGE/ORDER I FOR ATIO
Consult LTC Marketing for parts specified with wider operating temperature ranges.
IN
SS_MAXDC
SENSE
< 25V
SD_V
T
JMAX
COMP
SYNC
R
V
GND
OSC
REF
SEC
= OC = Open
FB
IN
= 125°C, θ
< 25V,
16-LEAD PLASTIC SSOP
1
2
3
4
5
6
7
8
SEC
GN PACKAGE
IN
= 2.64V
JA
TOP VIEW
OSC
= 15V, SOUT = open, unless otherwise specified.
= 110°C/W, θ
= 178k, SYNC = 0V, SS_MAXDC = V
16
15
14
13
12
11
10
JC
9
●
●
●
●
●
●
●
●
= 40°C/W
SOUT
V
OUT
PGND
DELAY
OC
I
BLANK
SENSE
IN
V
1.261
12.75
2.425
3.75
MIN
IN OFF
165
440
9.5
8.0
80
U
www.DataSheet4U.com
14.25
1.32
11.2
8.75
1.25
0.05
TYP
200
100
500
5.2
5.5
2.5
1.5
460
240
18
0
1
1
1
ORDER PART
LT1952EGN
LT1952IGN
MARKING
NUMBER
GN PART
W
1952E
1952I
1.379
15.75
2.575
MAX
12.9
9.25
6.75
0.33
700
350
240
120
560
6.5
2.2
1.5
25
10
10
REF
, V
UNITS
U
REF
1952f
%/V
kHz
kHz
kHz
mA
mV
mV
kΩ
µA
µA
µA
µA
V
V
V
V
V
V
V
V