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LT1508I Datasheet

  • LT1508I

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

  • LINER

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LT1508
Power Factor and PWM
Controller (Voltage Mode)
FEATURES
s
s
s
s
s
s
s
s
s
s
s
s
DESCRIPTION
The LT
廬
1508 is a complete solution for universal off-line
switching power supplies utilizing active power factor
correction. The PFC section is identical to the LT1248 PFC
controller except the EN/SYNC pin is removed because
PFC and PWM are synchronized internally.
The voltage mode PWM section (LT1509 is the current
mode counterpart) contains all the primary side functions
to convert the PFC preregulated high voltage output to an
isolated low voltage output. The PWM duty cycle is
internally limited to 47% (maximum 50%) to prevent
transformer saturation. PWM soft start begins when the
PFC output reaches the preset voltage. In the event of brief
line loss, PWM will be shut off when the PFC output
voltage drops below 73% of the preset value.
, LTC and LT are registered trademarks of Linear Technology Corporation.
PFC and PWM Single Chip Solution
Synchronized Operation up to 300kHz
99% Power Factor Over 20:1 Load Current Range
Voltage Mode PWM
Instantaneous Overvoltage Protection
Dedicated Overvoltage Protection (OVP Pin)
Minimal Line Current Dead Zone
Typical 250碌A(chǔ) Start-Up Supply Current
Line Switching Noise Filter
Low Quiescent Current: 13mA
Fast 1.5A Peak Current Gate Drivers
Separate Soft Start Control
APPLICATIONS
s
Universal Power Factor Corrected Power Supplies
and Preregulators
BLOCK DIAGRAM
V
CC
16V TO 10V
VA
OUT
10
V
REF
7.5V
V
REF
RUN
12
M
OUT
I
SENSE
8
7
CA
OUT
6
+
鈥?/div>
2.2V
7碌A(chǔ)
+
M1
V
SENSE
14
7.5V
鈥?/div>
鈥?/div>
EA
鈥?/div>
I
M
CA
I
A
25k
I
B
I
M
=
I
A2
I
B
200碌A(chǔ)
2
鈥?/div>
+
RUN
+
I
AC
9
+
+
0.7V
R
2R
7.9V
OVP
11
SS1
16
14碌A(chǔ)
+
鈥?/div>
鈥?/div>
OSC
16V
GND2
2
+
1V
鈥?/div>
CL
4 C
SET
R
SET
15
55%
DELAY
S
鈥?/div>
14碌A(chǔ)
SS2
13
PWMOK
鈥?/div>
7V TO
4.7V
+
+
鈥?/div>
+
NOTE: PWM PULSE IS DELAYED BY 55% DUTY CYCLE
AFTER PFC PULSE
19 I
LIM
V
C
18
50碌A(chǔ)
U
W
U
GND1
3
PK
LIM
V
CC
5
17
鈥?/div>
+
R
R
S
Q
GTDR1
1
R
R
Q
GTDR2
20
200ns
BLANKING
16V
1508 BD
1

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