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LT1508I Datasheet

  • LT1508I

  • Linear Technology [Power Factor and PWM Controller(Voltage ...

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LT1508
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
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.
ABSOLUTE
MAXIMUM
RATINGS
Supply Voltage ........................................................ 27V
GTDR Current Continuous ...................................... 0.5A
GTDR Output Energy ................................................ 5碌J
I
AC
, R
SET
, PK
LIM
Input Current .............................. 20mA
V
SENSE
, OVP Input Voltage .................................... V
MAX
I
LIM
, V
C
Input Voltage ................................................ 8V
I
SENSE
, M
OUT
Input Current ...................................
鹵5mA
Operating Junction Temperature Range
LT1508C ................................................ 0擄C to 100擄C
LT1508I ............................................ 鈥?40擄C to 125擄C
Thermal Resistance (Junction-to-Ambient)
N Package ................................................... 100擄C/W
SW Package ................................................ 120擄C/W
PACKAGE/ORDER INFORMATION
TOP VIEW
GTDR1 1
GND2 2
GND1 3
C
SET
4
PK
LIM
5
CA
OUT
6
I
SENSE
7
M
OUT
8
I
AC
9
VA
OUT
10
N PACKAGE
20-LEAD PDIP
20 GTDR2
19 I
LIM
18 V
C
17 V
CC
16 SS1
15 R
SET
14 V
SENSE
13 SS2
12 V
REF
11 OVP
SW PACKAGE
20-LEAD PLASTIC SO WIDE
ORDER PART
NUMBER
LT1508CN
LT1508CSW
LT1508IN
LT1508ISW
T
JMAX
= 125擄C,
胃
JA
= 100擄C/ W (N)
T
JMAX
= 125擄C,
胃
JA
= 120擄C/ W (SW)
Consult factory for Military grade parts.
ELECTRICAL CHARACTERISTICS
Maximum operating voltage (V
MAX
) = 25V, V
CC
= 18V, R
SET
= 15k to GND, C
SET
= 1nF to GND, I
AC
= 100碌A, I
SENSE
= 0V, CA
OUT
= 3.5V,
VA
OUT
= 5V, OVP = V
REF
. No load on any outputs unless otherwise noted.
PARAMETER
Overall
Supply Current (V
CC
in Undervoltage Lockout)
Supply Current On
V
CC
Turn-On Threshold (Undervoltage Lockout)
V
CC
Turn-Off Threshold
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
CONDITIONS
V
CC
= Lockout Voltage 鈥?0.2V
11.5V
鈮?/div>
V
CC
鈮?/div>
V
MAX
q
q
q
q
MIN
TYP
0.25
13
16.5
10.5
MAX
0.45
19
17.5
11.5
10
鈥?250
UNITS
mA
mA
V
V
mV
nA
dB
MHz
V
V
mA
15.5
9.5
鈥?10
70
VA
OUT
= 3.5V
V
SENSE
= 0V to 7V
q
q
q
q
11.3
3
VA
OUT
= 0V
q
鈥?25
100
3
13.3
1.1
8
2
17
2
U
W
U
U
W W
U
W

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