IC PFC CTRLR AVERAGE CURR 20DIP

LT1509IN

Manufacturer Part NumberLT1509IN
DescriptionIC PFC CTRLR AVERAGE CURR 20DIP
ManufacturerLinear Technology
LT1509IN datasheet
 


Specifications of LT1509IN

ModeAverage CurrentFrequency - Switching100kHz
Voltage - Supply27VOperating Temperature-40°C ~ 125°C
Mounting TypeThrough HolePackage / Case20-DIP (0.300", 7.62mm)
Lead Free Status / RoHS StatusContains lead / RoHS non-compliantCurrent - Startup-
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FEATURES
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
U
APPLICATIONS
Universal Power Factor Corrected Power Supplies
and Preregulators
W
BLOCK
DIAGRAM
VA
OUT
10
+
V
CC
16V TO 10V
2.2V
V
SENSE
14
EA
+
7.5V
25k
I
AC
9
+
7.9V
OVP
11
14 A
SS1
16
7V to
+
14 A
4.7V
PWM0K
SS2
13
NOTE: PWM PULSE IS DELAYED BY 55% DUTY CYCLE AFTER PFC PULSE
DESCRIPTION
®
The LT
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.
V
M
I
CA
REF
OUT
SENSE
OUT
7.5V
12
8
7
6
V
REF
RUN
7 A
+
M1
I
I
A
CA
M
+
2
I
I
A
B
I
=
M
2
200 A
I
B
+
4
C
SET
+
CL
1V
+
1.2V
+
+
50 A
19
18
RAMP
V
C
LT1509
Power Factor and
PWM Controller
U
GND1
PK
3
5
+
R
R
Q
RUN
+
S
0.7V
OSC
16V
15
R
SET
55%
DELAY
R
S
Q
R
200ns
16V
BLANKING
V
LIM
CC
17
GTDR1
1
GND2
2
GTDR2
20
1500 • BD01
1

LT1509IN 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

    ... V CC MAX VA = 3.5V OUT SENSE OUT U W INFORMATION ORDER PART TOP VIEW NUMBER 20 GTDR2 19 RAMP LT1509CN LT1509CSW LT1509IN 16 SS1 LT1509ISW 15 R SET 14 V SENSE 13 SS2 12 V REF 11 OVP SW PACKAGE 20-LEAD PLASTIC SO WIDE = 125 C, = 100 125 C, = 120 C/ W (SW 100 0V SENSE OUT ...

  • 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 ...