LT1509 Linear Technology, LT1509 Datasheet - Page 4
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LT1509
Manufacturer Part Number
LT1509
Description
Power Factor and PWM Controller
Manufacturer
Linear Technology
Datasheet
1.LT1509.pdf
(16 pages)
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4
LT1509
ELECTRICAL C
V
outputs, unless otherwise noted.
PARAMETER
Soft Start Current
SS1 Current (PFC)
SS2 Current (PWM)
Comparators in PWM Section
RAMP Input Current
Current Limit Comparator (CL) Threshold
GTDR2 Switching Off Threshold at V
V
PWMOK Comparator Low Threshold (in Terms of V
V
GTDR2 Turn-On Blanking Time
The
temperature range.
Note 1: Multiplier Gain Constant: K =
TYPICAL PERFORMANCE CHARACTERISTICS
C
C
CC
–20
100
Input Current
Pin High Voltage (LT1509)
80
60
40
20
= 18V, R
0
10
denotes specifications which apply over the full operating
PFC Voltage Amplifier Open-Loop
Gain and Phase
100
SET
= 15k to GND, C
1k
FREQUENCY (Hz)
PHASE
GAIN
10k
HARA TERISTICS
100k
C
W
SET
or at SS2
LT1509 • TPC01
1M
I
AC
= 1nF to GND, I
C
(VA
U
10M
I
OUT
M
0
–20
–40
–60
–80
–100
–120
– 2)
REF
2
)
AC
100
–20
80
60
40
20
= 100 A, I
0
CONDITIONS
SS1 = 2.5V
SS2 = 1V
RAMP = 0V, V
V
RAMP = 0V
V
1mA into V
10
PFC Current Amplifier Open-Loop
Gain and Phase
C
C
> 2.6V
= 0V
100
SENSE
C
1k
Pin
FREQUENCY (Hz)
C
PHASE
GAIN
= 1.6V
Note 2: GTDR2 (PWM) pulse is delayed by 53% duty cycle after GTDR1
(PFC) is set. See PFC/PWM Synchronization graph in the Typical
Performance Characteristics section.
= 0V, CA
10k
100k
OUT
= 3.5V, VA
LT1509 • TPC02
1M
10M
0
–20
–40
–60
–80
–100
–120
OUT
= 5V, OVP = V
0.95
0.57
MIN
– 20
2.6
PFC/PWM Synchronization
5
5
1
53%
– 0.3
0.63
TYP
180
1.1
3.2
12
12
REF
PWM (GTDR2)
PFC (GTDR1)
. No load on any
TIME
MAX
0.70
– 80
– 2
1.2
3.8
30
30
LT1509 TPC03
UNITS
ns
A
A
A
V
V
A
V