LT1508ISW Linear Technology, LT1508ISW Datasheet - Page 2

• Manufacturer Part Number: LT1508ISW
• Description: IC PWM/POWER FACTOR CNTRLR20SOIC
• Manufacturer: Linear Technology

Specifications of LT1508ISW

• Mode: Average Current
• Frequency - Switching: 100kHz
• Voltage - Supply: 27V
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: 20-SOIC (7.5mm Width)
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Current - Startup: -

ABSOLUTE
2
DESCRIPTION
By using fixed high frequency PWM current averaging
without the need for slope compensation, the LT1508
achieves far lower line current distortion with a smaller
magnetic element than systems that use either peak
current detection, or zero current switching approach, in
both continuous and discontinuous modes of operation.
The LT1508 also provides filtering capability to reject line
LT1508
Supply Voltage ........................................................ 27V
GTDR Current Continuous ...................................... 0.5A
GTDR Output Energy ................................................ 5 J
I
V
I
I
Operating Junction Temperature Range
Thermal Resistance (Junction-to-Ambient)
ELECTRICAL CHARACTERISTICS
Maximum operating voltage (V
VA
PARAMETER
Overall
Supply Current (V
Supply Current On
V
V
Voltage Amplifier (PFC Section)
Voltage Amp Offset
Input Bias Current
Voltage Gain
Voltage Amp Unity-Gain Bandwidth
Voltage Amp Output High (Internally Clamped)
Voltage Amp Output Low
Voltage Amp Short-Circuit Current
AC
LIM
SENSE
CC
CC
SENSE
OUT
LT1508C ................................................ 0 C to 100 C
LT1508I ............................................ – 40 C to 125 C
N Package ................................................... 100 C/W
SW Package ................................................ 120 C/W
, R
Turn-On Threshold (Undervoltage Lockout)
Turn-Off Threshold
, V
SET
= 5V, OVP = V
, M
C
, OVP Input Voltage .................................... V
Input Voltage ................................................ 8V
, PK
OUT
LIM
Input Current ................................... 5mA
CC
in Undervoltage Lockout)
Input Current .............................. 20mA
REF
W
MAXIMUM
U
. No load on any outputs unless otherwise noted.
W W
MAX
) = 25V, V
RATINGS
CC
CONDITIONS
V
11.5V V
VA
V
VA
CC
SENSE
= 18V, R
OUT
OUT
= Lockout Voltage – 0.2V
U
= 3.5V
= 0V
= 0V to 7V
CC
SET
V
= 15k to GND, C
MAX
MAX
switching noise which can cause instability when fed into
the multiplier. Line current dead zone is minimized with
low bias voltage at the current input to the multiplier. The
LT1508 provides many protection features including peak
current limiting and overvoltage protection. Implemented
with a very high speed process, the LT1508 can be
operated at frequencies as high as 300kHz.
PACKAGE/ORDER
Consult factory for Military grade parts.
GTDR1
CA
I
VA
PK
GND2
GND1
SENSE
20-LEAD PDIP
M
C
N PACKAGE
SET
OUT
OUT
OUT
SET
LIM
I
AC
T
T
= 1nF to GND, I
JMAX
JMAX
10
1
2
3
4
5
6
7
8
9
= 125 C,
= 125 C,
TOP VIEW
20-LEAD PLASTIC SO WIDE
JA
JA
= 100 C/ W (N)
= 120 C/ W (SW)
AC
SW PACKAGE
= 100 A, I
20
19
18
17
16
15
14
13
12
11
15.5
11.3
MIN
– 10
9.5
70
GTDR2
I
V
V
SS1
R
V
SS2
V
OVP
3
LIM
C
CC
SET
SENSE
REF
INFORMATION
U
SENSE
0.25
16.5
10.5
13.3
TYP
– 25
100
1.1
13
3
8
= 0V, CA
ORDER PART
LT1508CN
LT1508CSW
LT1508IN
LT1508ISW
W
NUMBER
– 250
MAX
0.45
17.5
11.5
19
10
17
2
OUT
= 3.5V,
UNITS
U
MHz
mA
mA
mV
mA
nA
dB
V
V
V
V