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LT1509ISW Datasheet

  • LT1509ISW

  • Power Factor and PWM Controller

  • 351.72KB

  • 16頁

  • LINER

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LT1509
Power Factor and
PWM Controller
FEATURES
s
s
s
s
s
s
s
s
s
s
s
s
DESCRIPTION
The LT
廬
1509 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 current mode PWM section (the LT1508 is the volt-
age-mode counterpart) contains all the primary side func-
tions 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 PFC
output reaches the preset voltage. In the event of brief line
loss, the 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
Current Mode PWM
Instantaneous Overvoltage Protection
Dedicated Overvoltage Protection (OVP Pin)
Minimal Line Current Dead Zone
Typical 250碌A Start-Up Supply Current
Line Switching Noise Filter
Low Quiescent Current: 13mA
Fast 2A Peak Current Gate Drivers
Separate Soft Start Controls
APPLICATIONS
s
Universal Power Factor Corrected Power Supplies
and Preregulators
BLOCK DIAGRAM
V
CC
VA
OUT
10
7.5V
V
REF
RUN
V
REF
12
M
OUT
I
SENSE
8
7
CA
OUT
6
+
鈥?/div>
2.2V
16V TO 10V
7碌A
+
M1
V
SENSE
14
鈥?/div>
鈥?/div>
EA
7.5V
I
A
25k
I
B
I
M
=
I
A2
I
B
200碌A
2
I
M
鈥?/div>
CA
I
AC
9
+
+
鈥?/div>
+
RUN
7.9V
OVP
11
SS1
16
14碌A
+
鈥?/div>
+
0.7V
鈥?/div>
4
+
1V
鈥?/div>
CL
C
SET
鈥?/div>
14碌A
SS2
13
PWM0K
鈥?/div>
7V to
4.7V
+
鈥?/div>
1.2V
+
+
+
鈥?/div>
19
NOTE: PWM PULSE IS DELAYED BY 55% DUTY CYCLE AFTER PFC PULSE
RAMP
18
V
C
50碌A
U
W
U
GND1
3
PK
LIM
V
CC
5
17
鈥?/div>
+
R
R
S
Q
GTDR1
1
OSC
16V
GND2
2
15
R
SET
55%
DELAY
R
S
R
Q
GTDR2
20
200ns
BLANKING
16V
1500 鈥?BD01
1

LT1509ISW 產(chǎn)品屬性

  • LT1509

  • 38

  • 集成電路 (IC)

  • PMIC - PFC（功率因數(shù)修正）

  • -

  • 平均電流

  • 100kHz

  • -

  • 27V

  • -40°C ~ 125°C

  • 表面貼裝

  • 20-SOIC（0.295"，7.50mm 寬）

  • 20-SOIC

  • 管件

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