LT1509ISW#TR Linear Technology, LT1509ISW#TR Datasheet

IC PFC CTRLR AVERAGE CURR 20SOIC

LT1509ISW#TR

Manufacturer Part Number
LT1509ISW#TR
Description
IC PFC CTRLR AVERAGE CURR 20SOIC
Manufacturer
Linear Technology
Datasheet

Specifications of LT1509ISW#TR

Mode
Average Current
Frequency - Switching
100kHz
Voltage - Supply
27V
Operating Temperature
-40°C ~ 125°C
Mounting Type
Surface Mount
Package / Case
20-SOIC (7.5mm Width)
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Current - Startup
-
Lead Free Status / Rohs Status
Not Compliant

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Part Number:
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Part Number:
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APPLICATIONS
BLOCK
FEATURES
SS2
NOTE: PWM PULSE IS DELAYED BY 55% DUTY CYCLE AFTER PFC PULSE
13
V
SENSE
OVP
SS1
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 A Start-Up Supply Current
Line Switching Noise Filter
Low Quiescent Current: 13mA
Fast 2A Peak Current Gate Drivers
Separate Soft Start Controls
Universal Power Factor Corrected Power Supplies
and Preregulators
16V TO 10V
I
14
11
16
AC
9
V
CC
14 A
7.5V
7.9V
14 A
DIAGRAM
PWM0K
+
U
+
+
EA
+
W
7V to
4.7V
VA
10
OUT
2.2V
25k
+
I
I
V
7.5V
A
B
1V
REF
RUN
+
I
M
RAMP
=
M1
19
200 A
I
A
2
I
+
B
V
12
2
REF
CL
1.2V
I
7 A
M
+
M
OUT
8
V
18
C
I
SENSE
7
50 A
+
DESCRIPTION
The LT
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.
CA
, LTC and LT are registered trademarks of Linear Technology Corporation.
+
®
CA
+
C
1509 is a complete solution for universal off-line
SET
OUT
6
4
0.7V
+
U
R
OSC
Power Factor and
15
SET
RUN
DELAY
55%
PWM Controller
R
R
S
GND1
BLANKING
3
200ns
Q
R
S
R
Q
16V
+
PK
16V
LT1509
5
LIM
V
17
CC
GND2
GTDR2
GTDR1
1500 • BD01
1
2
20
1

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LT1509ISW#TR Summary of contents

Page 1

... 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 ...

Page 2

LT1509 U DESCRIPTION By using fixed high frequency PWM current averaging without the need for slope compensation, the LT1509 achieves far lower line current distortion with a smaller magnetic element than systems that use either peak current detection, or zero ...

Page 3

ELECTRICAL C HARA TERISTICS C Maximum operating voltage ( 25V, V MAX VA = 5V, OVP = load on any outputs unless otherwise noted. OUT REF PARAMETER Current Amplifier (PFC Section) Current Amp Offset Voltage ...

Page 4

LT1509 ELECTRICAL C HARA TERISTICS 18V 15k to GND 1nF to GND SET SET outputs, unless otherwise noted. PARAMETER Soft Start Current SS1 Current (PFC) SS2 Current (PWM) Comparators in PWM ...

Page 5

W U TYPICAL PERFORMANCE CHARACTERISTICS Reference Voltage vs Temperature 7.536 7.524 7.512 7.500 7.488 7.476 7.464 7.452 7.440 7.428 –75 –50 – JUNCTION TEMPERATURE ( C) Supply Current vs Supply Voltage –55 C ...

Page 6

LT1509 W U TYPICAL PERFORMANCE CHARACTERISTICS R Voltage vs Current SET 120 100 –20 –40 –60 –80 –100 0 –0.2 –0.4 –0.6 R CURRENT (mA) SET PIN FUNCTIONS (For application help with ...

Page 7

PIN FUNCTIONS (For application help with the PFC portion of this chip, see the LT1248 data sheet) R (Pin 15): A resistor from R SET oscillator charging current and the maximum multiplier output current which is used ...

Page 8

LT1509 APPLICATIONS INFORMATION 0.15 – REF 20k OUT SENSE R IAC Figure 2 ...

Page 9

U U APPLICATIONS INFORMATION (P )(R )(25)( OUT 2 (V )(R IN See Figure 2 for R . REF VA is squared in the multiplier, resulting in excellent OUT performance over a wide range ...

Page 10

LT1509 U U APPLICATIONS INFORMATION line current reaches the secondary limit, the comparator takes over control and hysteresis may occur causing audible noise. Overvoltage Protection (PFC Section) Because of the slow loop response necessary for power factor correction, output overshoot ...

Page 11

U U APPLICATIONS INFORMATION input and then the SS2 voltage continues beyond The PWMOK comparator contains hysteresis and will C pull SS2 low disabling the PWM section if the PFC output voltage falls below ...

Page 12

LT1509 U U APPLICATIONS INFORMATION The total equivalent 120Hz ripple in the output capacitor can be calculated by RMS 120HZ 1. 100kHz Ripple Current. HF For I = 0.88A, 1 ...

Page 13

U U APPLICATIONS INFORMATION W U LT1509 13 ...

Page 14

LT1509 U U APPLICATIONS INFORMATION An LT1431 reference/amplifier coupled to a low cost optoisolator closes the loop from secondary side to pri- mary side. Unity loop frequency is a conservative 3kHz. Figure 10 shows the output voltage’s response with a ...

Page 15

... DIMENSION DOES NOT INCLUDE INTERLEAD FLASH. INTERLEAD FLASH SHALL NOT EXCEED 0.010" (0.254mm) PER SIDE Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen- tation that the interconnection of its circuits as described herein will not infringe on existing patent rights. ...

Page 16

... Good for Post Regulation of Switching Power Supplies Solution for Universal Off-Line Inputs with Output to 100W Operates at Oscillator Frequencies up to 500kHz Operates at Oscillator Frequencies up to 1MHz Provides All Features in 16-Lead Package Simplified PFC Design Voltage Mode PWM : 499-3977 LT/GP 1295 10K • PRINTED IN USA LINEAR TECHNOLOGY CORPORATION 1995 ...

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