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LT1508CSW Datasheet(PDF) 1 Page - Linear Technology

Part # LT1508CSW
Description  Power Factor and PWM Controller(Voltage Mode)
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LT1508CSW Datasheet(HTML) 1 Page - Linear Technology

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1
LT1508
Power Factor and PWM
Controller (Voltage Mode)
, LTC and LT are registered trademarks of Linear Technology Corporation.
s
PFC and PWM Single Chip Solution
s
Synchronized Operation up to 300kHz
s
99% Power Factor Over 20:1 Load Current Range
s
Voltage Mode PWM
s
Instantaneous Overvoltage Protection
s
Dedicated Overvoltage Protection (OVP Pin)
s
Minimal Line Current Dead Zone
s
Typical 250
µA Start-Up Supply Current
s
Line Switching Noise Filter
s
Low Quiescent Current: 13mA
s
Fast 1.5A Peak Current Gate Drivers
s
Separate Soft Start Control
FEATURES
DESCRIPTION
APPLICATIONS
s
Universal Power Factor Corrected Power Supplies
and Preregulators
The LT
® 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.
+
+
+
11
16
13
+
+
+
IM =
IA2IB
200
µA2
4
15
19
18
1508 BD
VSENSE
7.5V
7.9V
VCC
16V TO 10V
14
µA
14
µA
7
µA
7V TO
4.7V
+
EA
CA
+
CL
2.2V
M1
IA
IM
IB
25k
1V
R
2R
14
VAOUT
10
VREF
7.5V
VREF
12
MOUT
8
ISENSE
7
CAOUT
6
CSET
RSET
ILIM
VC
50
µA
RUN
RUN
R
R
Q
S
S
RQ
R
OSC
55%
DELAY
200ns
BLANKING
PKLIM
5
GND1
3
VCC
17
GTDR1
16V
16V
1
GND2
2
GTDR2
20
IAC
9
OVP
SS1
SS2
PWMOK
0.7V
+
+
NOTE: PWM PULSE IS DELAYED BY 55% DUTY CYCLE
AFTER PFC PULSE
+
+
BLOCK DIAGRAM


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