ltc3803es6-3 Linear Technology Corporation, ltc3803es6-3 Datasheet

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ltc3803es6-3

Manufacturer Part Number
ltc3803es6-3
Description
Constant Frequency Current Mode Flyback Dc/dc Controller In Thinsot
Manufacturer
Linear Technology Corporation
Datasheet

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Company
Part Number
Manufacturer
Quantity
Price
Part Number:
LTC3803ES6-3
Manufacturer:
LT
Quantity:
10 000
Part Number:
ltc3803es6-3#TRPBF
Manufacturer:
NXP
Quantity:
12 400
FEATURES
TYPICAL APPLICATIO
ThinSOT is a trademark of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
APPLICATIO S
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
V
Adjustable Slope Compensation
Internal Soft-Start
–40°C to 125°C Operating Temperature Range
Constant Frequency 300kHz Operation
±1.5% Reference Accuracy
Current Mode Operation for Excellent Line and Load
Transient Response
No Minimum Load Requirement
Low Quiescent Current: 240μA
Low Profile (1mm) SOT-23 Package
Telecom Power Supplies
42V and 12V Automotive Power Supplies
Auxiliary/Housekeeping Power Supplies
Power Over Ethernet Powered Devices
IN
82k
5V Output Nonisolated Telecom Housekeeping Power Supply
and V
X5R
470pF
1μF
10V
OUT
I
GND
TH
20k
Limited Only by External Components
36V TO 72V
/RUN
LTC3803-3
V
V
U
V
CC
FB
IN
10k
NGATE
SENSE
105k
1μF
100V
X5R
4.7k
T1: COOPER CTX02-15242
*THREE 100μF UNITS IN PARALLEL
U
T1
FDC2512
68mΩ
UPS840
220Ω
150pF
200V
300μF*
6.3V
X5R
38033 TA01
V
5V
2A MAX
OUT
DESCRIPTIO
The LTC
flyback controller optimized for driving 6V-rated N-channel
MOSFETs in high input voltage applications. Constant
frequency operation is maintained down to very light
loads, resulting in less low frequency noise generation
over a wide range of load currents. Slope compensation
can be programmed with an external resistor.
The LTC3803-3 provides ±1.5% output voltage accuracy
and consumes only 240μA of quiescent current. Ground-
referenced current sensing allows LTC3803-3-based con-
verters to accept input supplies beyond the LTC3803-3’s
absolute maximum V
feature allows efficient operation at high input voltages.
For simplicity, the LTC3803-3 can also be powered from
a high V
regulator. An internal undervoltage lockout shuts down
the LTC3803-3 when the input voltage falls below 4.4V,
guaranteeing at least 4.4V of gate drive to the external
MOSFET.
The LTC3803-3 is available in a low profile (1mm) 6-lead
SOT-23 (ThinSOT
DC/DC Controller in ThinSOT
IN
®
3803-3 is a constant frequency current mode
through a resistor, due to its internal 9.4V shunt
Current Mode Flyback
Constant Frequency
100
TM
95
90
85
80
75
70
65
60
55
50
250
U
) package.
CC
V
OUT
. A micropower hysteretic start-up
Efficiency vs Load Current
500
= 5V
750
LOAD CURRENT (mA)
1000
1250 1500
LTC3803-3
V
V
V
V
IN
IN
IN
IN
1750 2000
= 36V
= 48V
= 60V
= 72V
38033 TA02
38033fa
1

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ltc3803es6-3 Summary of contents

Page 1

... Auxiliary/Housekeeping Power Supplies Power Over Ethernet Powered Devices ■ , LT, LTC and LTM are registered trademarks of Linear Technology Corporation. ThinSOT is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners. U TYPICAL APPLICATIO 5V Output Nonisolated Telecom Housekeeping Power Supply ...

Page 2

... PACKAGE/ORDER * CC CC ORDER PART NUMBER LTC3803ES6-3 LTC3803IS6-3 Order Options Tape and Reel: Add #TR Lead Free: Add #PBF Lead Free Tape and Reel: Add #TRPBF Lead Free Part Marking: http://www.linear.com/leadfree/ Consult LTC Marketing for parts specified with wider operating temperature ranges. ...

Page 3

ELECTRICAL CHARACTERISTICS temperature range, otherwise specifications are at T SYMBOL PARAMETER DC Minimum Switch On Duty Cycle ON(MIN) DC Maximum Switch On Duty Cycle ON(MAX) t Gate Drive Rise Time RISE t Gate Drive Fall Time FALL I Peak Slope ...

Page 4

LTC3803 TYPICAL PERFOR A CE CHARACTERISTICS Reference Voltage vs Temperature 812 808 804 800 796 792 788 –30 – 110 – TEMPERATURE (°C) 38033 G01 Oscillator Frequency vs Temperature ...

Page 5

W U TYPICAL PERFOR A CE CHARACTERISTICS Start-Up I Supply Current CC vs Temperature – 0.1V CC TURNON –50 –30 – 110 TEMPERATURE (°C) ...

Page 6

LTC3803 CTIO S I /RUN (Pin 1): This pin performs two functions serves as the error amplifier compensation point as well as the run/shutdown control input. Nominal voltage range is 0.7V to 1.9V. ...

Page 7

U OPERATIO The LTC3803 constant frequency current mode controller for flyback and DC/DC boost converter applica- tions in a tiny ThinSOT package. The LTC3803-3 is de- signed so that none of its pins need to come in contact ...

Page 8

LTC3803-3 U OPERATIO Start-Up/Shutdown The LTC3803-3 has two shutdown mechanisms to disable and enable operation: an undervoltage lockout on the V supply pin voltage, and a forced shutdown whenever external circuitry drives the I TH LTC3803-3 transitions into and out ...

Page 9

U OPERATIO Powering the LTC3803-3 In the simplest case, the LTC3803-3 can be powered from a high voltage supply through a resistor. A built-in shunt regulator from the V pin to GND will draw as much CC current as needed ...

Page 10

LTC3803 APPLICATIO S I FOR ATIO Many LTC3803-3 application circuits can be derived from the topology shown in Figure 2. The LTC3803-3 itself imposes no limits on allowed power output, input voltage V or desired regulated output volt- ...

Page 11

U U APPLICATIO S I FOR ATIO CURRENT SENSE RESISTOR CONSIDERATIONS The external current sense resistor (R allows the user to optimize the current limit behavior for the particular application. As the current sense resistor is varied from several ohms ...

Page 12

LTC3803 APPLICATIO S I FOR ATIO One potential design pitfall is undersizing the value of capacitor this case, the normal supply current VCC drawn by the LTC3803-3 will discharge C before the third winding drive ...

Page 13

U TYPICAL APPLICATIO S PRIMARY SIDE 10V, 100mA OUTPUT V IN 36V TO 75V 1nF 22k 806Ω 2W Isolated Housekeeping Telecom Converter BAS516 T1 • 2.2μF 1μF BAS516 • BAS516 9.2k 1k 220k • LTC3803 /RUN NGATE ...

Page 14

LTC3803-3 U TYPICAL APPLICATIO S 4:1 Input Range 3.3V Output Isolated Flyback DC/DC Converter + 72V 2.2μF 220k – MMBTA42 V IN PDZ6. /RUN GATE TH LTC3803 ...

Page 15

... MOLD FLASH SHALL NOT EXCEED 0.254mm 6. JEDEC PACKAGE REFERENCE IS MO-193 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. U ...

Page 16

... Photoflash Capacitor Charger in 5-Pin SOT-23 LTC3803 Constant Frequency Flyback Controller LTC3803-5 Constant Frequency Flyback Controller LTC3806 Synchronous Flyback Controller Burst Mode is a registered trademark of Linear Technology Corporation Linear Technology Corporation 16 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 FAX: (408) 434-0507 ● ...

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