ltc3803es6-trpbf Linear Technology Corporation, ltc3803es6-trpbf Datasheet

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ltc3803es6-trpbf

Manufacturer Part Number
ltc3803es6-trpbf
Description
Constant Frequency Current Mode Flyback Dc/dc Controller In Thinsot
Manufacturer
Linear Technology Corporation
Datasheet
FEATURES
TYPICAL APPLICATIO
ThinSOT is a trademark of Linear Technology Corporation.
APPLICATIO S
, LTC and LT are registered trademarks of Linear Technology Corporation.
V
Adjustable Slope Compensation
Internal Soft-Start
Constant Frequency 200kHz 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
IN
56k
and V
0.0022μF
5V Output Nonisolated Telecom Housekeeping Power Supply
10μF
X5R
10V
OUT
Limited Only by External Components
I
GND
TH
20k
36V TO 72V
/RUN
U
LTC3803
V
V
V
CC
FB
IN
10k
NGATE
SENSE
105k
4.7μF
100V
X5R
U
T1: COOPER CTX02-15242
*THREE 100μF UNITS IN PARALLEL
T1
FDC2512
68mΩ
UPS840
300μF*
6.3V
X5R
3803 TA01
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 provides ±1.5% output voltage accuracy
and consumes only 240μA of quiescent current. Ground-
referenced current sensing allows LTC3803-based con-
verters to accept input supplies beyond the LTC3803’s
absolute maximum V
feature allows efficient operation at high input voltages.
For simplicity, the LTC3803 can also be powered from a
high V
regulator. An internal undervoltage lockout shuts down
the LTC3803 when the input voltage falls below 4.6V,
guaranteeing at least 4.6V of gate drive to the external
MOSFET.
The LTC3803 is available in a low profile (1mm) 6-lead
SOT-23 (ThinSOT
V
5V
2A MAX
OUT
DC/DC Controller in ThinSOT
IN
through a resistor, due to its internal 9.4V shunt
®
3803 is a constant frequency current mode
Current Mode Flyback
Constant Frequency
90
80
70
60
50
40
30
20
10
TM
0
0.1
U
) package.
CC
V
IN
. A micropower hysteretic start-up
Efficiency vs Load Current
V
= 36V
IN
= 72V
V
IN
= 60V
V
I
OUT
IN
1
= 48V
(A)
LTC3803
3803 TA02
10
3803fa
1

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ltc3803es6-trpbf Summary of contents

Page 1

... Automotive Power Supplies Auxiliary/Housekeeping Power Supplies ■ Power Over Ethernet ■ , LTC and LT are registered trademarks of Linear Technology Corporation. ThinSOT is a trademark of Linear Technology Corporation. U TYPICAL APPLICATIO 5V Output Nonisolated Telecom Housekeeping Power Supply V IN 36V TO 72V 4.7μ ...

Page 2

... V = 0.8V ITH/RUN 1.3V 0.8V ITH/RUN 3000pF LOAD C = 3000pF LOAD (Note 6) SL (Note INFORMATION ORDER PART NUMBER TOP VIEW LTC3803ES6 6 NGATE LTC3803IS6 SENSE S6 PART S6 PACKAGE MARKING = 125°C, θ = 230°C/W LTACV JA LTBNC MIN TYP MAX ● 7.8 8.7 9.2 ● 4.6 5.7 6.8 ● ...

Page 3

ELECTRICAL CHARACTERISTICS Note 1: Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. Exposure to any Absolute Maximum Rating condition for extended periods may affect device reliability and lifetime. Note 2: The LTC3803E is ...

Page 4

LTC3803 W U TYPICAL PERFOR A CE CHARACTERISTICS Oscillator Frequency vs Temperature 240 230 220 210 200 190 180 50 70 –50 –30 – 110 TEMPERATURE (°C) 3803 G04 V Undervoltage Lockout CC ...

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) 3803 ...

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 is a constant frequency current mode con- troller for flyback and DC/DC boost converter applications in a tiny ThinSOT package. The LTC3803 is designed so that none of its pins need to come in contact with ...

Page 8

LTC3803 U OPERATIO Start-Up/Shutdown The LTC3803 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 /RUN pin low. The LTC3803 TH ...

Page 9

U OPERATIO Powering the LTC3803 In the simplest case, the LTC3803 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 U U APPLICATIO S I FOR ATIO Many LTC3803 application circuits can be derived from the topology shown in Figure 2. The LTC3803 itself imposes no limits on allowed power output, input voltage V or desired regulated output IN ...

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 U U APPLICATIO S I FOR ATIO and the V node begins to charge via R CC the V turn-on threshold. Depending on the particular CC situation, this may result in either several on-off cycles before proper operation is ...

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 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

... Current Mode PWM Controller LT3420 Photoflash Capacitor Charger with Automatic Refresh LT3468/LT3468-1 Photoflash Capacitor Charger in 5-Pin SOT-23 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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