LT1248IS Linear Technology, LT1248IS Datasheet

IC PFC CTRLR AVERAGE CURR 16SOIC

LT1248IS

Manufacturer Part Number
LT1248IS
Description
IC PFC CTRLR AVERAGE CURR 16SOIC
Manufacturer
Linear Technology
Datasheet

Specifications of LT1248IS

Mode
Average Current
Frequency - Switching
300kHz
Current - Startup
250µA
Voltage - Supply
15.5 V ~ 27 V
Operating Temperature
-40°C ~ 125°C
Mounting Type
Surface Mount
Package / Case
16-SOIC (3.9mm Width)
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant

Available stocks

Company
Part Number
Manufacturer
Quantity
Price
Part Number:
LT1248IS
Manufacturer:
LINEAR/凌特
Quantity:
20 000
Part Number:
LT1248IS#PBF
Manufacturer:
LINEAR/凌特
Quantity:
20 000
Part Number:
LT1248IS#TRPBF
Manufacturer:
LINEAR/凌特
Quantity:
20 000
FEATURES
BLOCK DIAGRA
APPLICATIO S
High Power Factor Over Wide Load Range
with Line Current Averaging
International Operation Without Switches
Instantaneous Overvoltage Protection
Minimal Line Current Dead Zone
Typical 250 A Start-Up Supply Current
Rejects Line Switching Noise
Synchronization Capability
Low Quiescent Current: 9mA
Fast 1.5A Peak Current Gate Driver
Universal Power Factor Corrected Power Supplies
Preregulators Up To 1500W
EN/SYNC
V
SENSE
OVP
I
10
11
SS
13
AC
6
8
16V TO 10V
2.6V/
2.2V
V
7.5V
CC
12 A
7.9V
+
+
U
+
+
EA
W
5V
VA
7
OUT
2.2V
+
32k
+
M1
I
I
B
A
ONE SHOT
V
V
7.5V
I
200ns
M
REF
REF
9
RUN
=
200 A
I
A
2
I
B
7 A
2
I
M
M
OUT
5
I
SENSE
4
DESCRIPTIO
The LT
universal off-line power systems. By using fixed high
frequency PWM current averaging, without the need for
slope compensation, the LT1248 achieves far lower line
current distortion with a smaller magnetic element than
systems that use either peak-current detection or zero
current switching approaches in both continuous and
discontinuous modes of operation.
The LT1248 uses a multiplier containing a square gain
function from the voltage amplifier to reduce the AC gain
at light output load and thus maintains low line current
distortion and high system stability. The LT1248 also
provides filtering capability to reject line switching noise
which can cause instability when fed into the multiplier.
Line current dead zone is minimized with low bias voltage
at the current input to the multiplier.
The LT1248 provides many protection features including
peak current limiting and overvoltage protection, and can
be operated at frequencies as high as 300kHz.
+
CA
, LTC and LT are registered trademarks of Linear Technology Corporation.
+
CA
C
14
Power Factor Controller
SET
OUT
3
®
1248 provides active power factor correction for
0.7V
+
PK
SYNC
2
LIM
+
OSC
R
12
SET
RUN
U
R
R
S
Q
GND
1 6V
1
V
15
CC
LT1248
1248 BD
GTDR
16
1

Related parts for LT1248IS

LT1248IS Summary of contents

Page 1

... Line current dead zone is minimized with low bias voltage at the current input to the multiplier. The LT1248 provides many protection features including peak current limiting and overvoltage protection, and can be operated at frequencies as high as 300kHz. , LTC and LT are registered trademarks of Linear Technology Corporation ...

Page 2

... SENSE OUT ORDER PART TOP VIEW NUMBER 1 16 GTDR LT1248CN SET LT1248IN LT1248CS SET LT1248IS SENSE 7 10 EN/SYNC REF N PACKAGE 16-LEAD PDIP S PACKAGE = 125 C, = 100 C/W ( 125 C, = 120 C/W ( 25V 18V 15k to GND, MAX CC SET MIN TYP MAX 0.25 0.45 ...

Page 3

ELECTRICAL C HARA TERISTICS C ture range, otherwise specifications are 1nF to GND 100 0V, CA SET AC SENSE PARAMETER Current Amplifier Current Amp Short-Circuit Current Input Range ...

Page 4

LT1248 W U TYPICAL PERFOR A Voltage Amplifier Open-Loop Gain and Phase 100 80 GAIN PHASE 0 – 10k 100k 100 FREQUENCY (Hz) Reference Voltage vs Temperature 7.536 7.524 7.512 7.500 7.488 7.476 7.464 7.452 ...

Page 5

W U TYPICAL PERFOR A GTDR Rise and Fall Time 400 300 FALL TIME 200 RISE TIME 100 NOTE: GTDR SLEWS BETWEEN 1V AND 16V LOAD CAPACITANCE (nF) 1248 G08 GTDR Maximum Duty ...

Page 6

LT1248 W U TYPICAL PERFOR A R Voltage vs Current SET 120 100 –20 –40 –60 –80 –100 0 –0.2 –0.4 –0.6 R CURRENT (mA) SET CTIO S Pin 1 ...

Page 7

CTIO S Pin resistor from R SET oscillator charging current and the maximum multiplier output current which is used to limit the maximum line current 3.75V/R M(MAX) SET Pin ...

Page 8

LT1248 PPLICATI S I FOR ATIO ripple fed back to the error amplifier is minimized. Note that switching ripple on the high impedance lines could get into the multiplier from the I pin and cause instability. ...

Page 9

PPLICATI S I FOR ATIO Note that V is the summing node and it stays at 7.5V. SENSE When overshoot occurs the overcurrent from R1 OUT will go through R2 as well as ...

Page 10

LT1248 PPLICATI S I FOR ATIO V /(V – 2V OUT For 382V V and 18V V , Np/Ns 19. OUT CC In Figure 6, a new technique for ...

Page 11

... IF GTDR IS NOT CLAMPED. 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. 300W, 382V Preregulator + – ...

Page 12

... Voltage Mode PWM, Simplified PFC Design Complete Solution for Universal Off-Line Switching Power Supplies 0.770* (19.558) MAX N16 1098 0.386 – 0.394* (9.804 – 10.008 0.150 – 0.157** (3.810 – 3.988) S16 1098 1248fd LT/GP 0799 2K REV D • PRINTED IN USA LINEAR TECHNOLOGY CORPORATION 1993 ...

Related keywords