ltc3803es6-5 Linear Technology Corporation, ltc3803es6-5 Datasheet

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ltc3803es6-5

Manufacturer Part Number
ltc3803es6-5
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:
LTC3803ES6-5
Manufacturer:
LT
Quantity:
10 000
Part Number:
ltc3803es6-5#TRPBF
Manufacturer:
LT
Quantity:
16 700
FEATURES
TYPICAL APPLICATIO
APPLICATIO S
ThinSOT is a trademark of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
V
4.8V Undervoltage Lockout Threshold
Operating Junction Temperature from –40°C to
150°C
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
, LTC and LT are registered trademarks of Linear Technology Corporation.
42V and 12V Automotive Power Supplies
Telecom Power Supplies
Auxiliary/Housekeeping Power Supplies
Power Over Ethernet
IN
and V
ALL CAPACITORS ARE X7R, TDK
10nF
8.06k
PDZ6.8B
7.5k
OUT
6V TO 50V
Limited Only by External Components
I
GND
V
TH
V
FB
IN
/RUN
LTC3803-5
Dual Output Wide Input Range Converter
U
57.6k
22k
NGATE
SENSE
V
0.1μF
CC
PHM25NQ10T
MMBTA42
4.7k
U
0.012Ω
1μF
100V
3x
VPH5-0155
100V
100V
1μF
1μF
10MQ100N
B3100
DESCRIPTIO
The LTC
flyback controller optimized for driving 4.5V and 6V-rated
N-channel MOSFETs in high input voltage applications.
The LTC3803-5 operates from inputs as low as 5V. Con-
stant 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 LTC3803-5 provides ±1.5% output voltage accuracy
and consumes only 240μA of quiescent current. Ground-
referenced current sensing allows LTC3803-5-based con-
verters to accept input supplies beyond the LTC3803-5’s
absolute maximum V
can be powered from a high V
its internal 8V shunt regulator. An internal undervoltage
lockout shuts down the IC when the input voltage falls
below 3.2V, guaranteeing at least 3.2V of gate drive to the
external MOSFET.
The LTC3803-5 is available in a low profile (1mm) 6-lead
SOT-23 (ThinSOT
22μF
10V
DC/DC Controller in ThinSOT
13V/0.3A
20mA MIN
LOAD
6.5V/1.2A
47μF
10V
38035 TA01
®
3803-5 is a constant frequency current mode
Current Mode Flyback
Constant Frequency
90
85
80
75
70
65
60
TM
0
U
) package.
V
V
V
V
IN
IN
IN
IN
CC
= 12V
= 24V
= 48V
= 12V
Efficiency and Power Loss
2
. For simplicity, the LTC3803-5
V
IN
OUTPUT POWER (W)
vs Output Power
= 8V
4
IN
through a resistor, due to
6
LTC3803-5
8
10
38035 TA01b
12
3.0
2.5
2.0
1.5
1.0
0.5
0
38035fb
1

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ltc3803es6-5 Summary of contents

Page 1

... Telecom 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. All other trademarks are the property of their respective owners. U TYPICAL APPLICATIO Dual Output Wide Input Range Converter ...

Page 2

... PACKAGE/ORDER * CC CC ORDER PART NUMBER LTC3803HS6-5 LTC3803ES6-5 voltage to 8V. CC 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 to 150°C operating junction temperature range, otherwise specifications are at T (Notes 2, 3) SYMBOL PARAMETER V V Turn On Voltage TURNON Turn Off Voltage TURNOFF Hysteresis HYST Shunt ...

Page 4

LTC3803 TYPICAL PERFOR A CE CHARACTERISTICS Reference Voltage vs Temperature 812 808 804 800 796 792 788 –50 –30 – 110 130 TEMPERATURE (°C) 38035 G01 Oscillator Frequency vs ...

Page 5

W U TYPICAL PERFOR A CE CHARACTERISTICS Start-Up I Supply Current CC vs Temperature – 0.1V CC TURNON –50 –30 – 110 130 150 ...

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, SEPIC and DC/DC boost converter applications in a tiny ThinSOT package. The LTC3803-5 is designed so that none of its pins need to come in contact with ...

Page 8

LTC3803-5 U OPERATIO The I /RUN pin serves as the compensation point for the TH control loop. Typically, an external series RC network is connected from I /RUN to ground and is chosen for TH optimal response to load and ...

Page 9

U OPERATIO Powering the LTC3803-5 In the simplest case, the LTC3803-5 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 LTC3803-5 application circuits can be derived from the topology shown in Figure 2. The LTC3803-5 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 Leakage Inductance Transformer leakage inductance (on either the primary or secondary) causes a voltage spike to occur after the output switch (Q1) turn-off. This is increasingly promi- nent at higher load currents, where ...

Page 12

LTC3803 APPLICATIO S I FOR ATIO effectively reducing the current comparator threshold in proportion to duty cycle. This stabilizes the control loop against subharmonic oscillation. The amount of reduction in the current comparator threshold (ΔV calculated using the ...

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

LTC3803-5 U TYPICAL APPLICATIO S 4:1 Input Range 3.3V Output Isolated Flyback DC/DC Converter + 72V 2.2μF 220k MMBTA42 – 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 with Automatic Refresh LT3468/LT3468-1 Photoflash Capacitor Charger in 5-Pin SOT-23 LTC3806 Synchronous Flyback Controller LTC4441 6A N-Channel MOSFET Driver 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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