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PDF LTC3803-5 Data sheet ( Hoja de datos )
| Número de pieza | LTC3803-5 | |
| Descripción | Constant Frequency Current Mode Flyback DC/DC Controller | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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FEATURES
■ VIN and VOUT Limited Only by External Components
■ 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
U
APPLICATIO S
■ 42V and 12V Automotive Power Supplies
■ Telecom Power Supplies
■ Auxiliary/Housekeeping Power Supplies
■ Power Over Ethernet
, LTC and LT are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
ThinSOT is a trademark of Linear Technology Corporation.
LTC3803-5
Constant Frequency
Current Mode Flyback
DC/DC Controller in ThinSOT
DESCRIPTIO
The LTC®3803-5 is a constant frequency current mode
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 VCC. For simplicity, the LTC3803-5
can be powered from a high VIN through a resistor, due to
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 (ThinSOTTM) package.
TYPICAL APPLICATIO
Dual Output Wide Input Range Converter
VIN
6V TO 50V
PDZ9.1B
22k
1µF
100V
3x
VPH5-0155 10MQ100N
MMBTA42
10nF
7.5k
8.06k
LTC3803-5
ITH/RUN NGATE
GND VCC
VFB SENSE
0.1µF
57.6k
PHM25NQ10T
4.7k
0.012Ω
1µF
100V
1µF
100V
B3100
ALL CAPACITORS ARE X7R, TDK
13V/0.3A
20mA MIN
LOAD
22µF
10V
6.5V/1.2A
47µF
10V
38035 TA01
Efficiency and Power Loss
vs Output Power
90 VIN = 8V
85 VIN = 12V
80
VIN = 24V
75
3.0
2.5
2.0
1.5
70
VIN = 48V
65
1.0
0.5
60 VIN = 12V
02
46 8
OUTPUT POWER (W)
0
10 12
38035 TA01b
38035f
1
1 page  
TYPICAL PERFOR A CE CHARACTERISTICS
LTC3803-5
Start-Up ICC Supply Current
vs Temperature
www.data70sheet4u.com
VCC = VTURNON – 0.1V
60
50
40
30
20
10
0
–50 –30 –10 10 30 50 70 90 110 130 150
TEMPERATURE (°C)
38035 G10
ITH/RUN Shutdown Threshold
vs Temperature
500
450
400
350
300
250
200
150
100
50
0
–50 –30 –10 10 30 50 70 90 110 130 150
TEMPERATURE (°C)
3803 G11
ITH/RUN Start-Up Current Source
vs Temperature
1000
VCC = VTURNON + 0.1V
900 VITH/RUN = 0V
800
700
600
500
400
300
200
100
0
–50 –30 –10 10 30 50 70 90 110 130 150
TEMPERATURE (°C)
38035 G12
Peak Current Sense Voltage
vs Temperature
120 VCC = 5V
115
110
105
100
95
90
85
80
–50 –30 –10 10 30 50 70 90 110 130 150
TEMPERATURE (°C)
38035 G13
Soft-Start Time vs Temperature
1.4
VCC = 5V
1.2
1.0
0.8
0.6
0.4
0.2
0
–50 –30 –10 10 30 50 70 90 110 130 150
TEMPERATURE (°C)
38035 G14
38035f
5
5 Page 
TYPICAL APPLICATIO S
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PRIMARY SIDE
10V, 100mA
OUTPUT
2W Isolated Housekeeping Telecom Converter
BAS516
T1
•
2.2µF
VIN
36V TO 75V
1nF
22k
806Ω
1µF BAS516
9.2k BAS516
1k
1 LTC3803-5 6
ITH/RUN NGATE
2
GND
VCC 5
3
VFB
4
SENSE
220k •
•
FDC2512
2.2µF
SECONDARY SIDE
10V, 100mA
OUTPUT
SECONDARY
SIDE GROUND
5.6k
1µF
T1: PULSE ENGINEERING PA0648
OR TYCO TTI8698
0.1Ω
PRIMARY GROUND
38035 TA03
PACKAGE DESCRIPTIO
0.62 0.95
MAX REF
S6 Package
6-Lead Plastic TSOT-23
(Reference LTC DWG # 05-08-1636)
2.90 BSC
(NOTE 4)
LTC3803-5
1.22 REF
3.85 MAX 2.62 REF
1.4 MIN
2.80 BSC
1.50 – 1.75
(NOTE 4)
PIN ONE ID
RECOMMENDED SOLDER PAD LAYOUT
PER IPC CALCULATOR
0.20 BSC
DATUM ‘A’
0.95 BSC
0.80 – 0.90
1.00 MAX
0.30 – 0.50 REF
0.09 – 0.20
NOTE:
(NOTE 3)
1. DIMENSIONS ARE IN MILLIMETERS
2. DRAWING NOT TO SCALE
3. DIMENSIONS ARE INCLUSIVE OF PLATING
4. DIMENSIONS ARE EXCLUSIVE OF MOLD FLASH AND METAL BURR
5. MOLD FLASH SHALL NOT EXCEED 0.254mm
6. JEDEC PACKAGE REFERENCE IS MO-193
1.90 BSC
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.
0.30 – 0.45
6 PLCS (NOTE 3)
0.01 – 0.10
S6 TSOT-23 0302
38035f
11
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet LTC3803-5.PDF ] | |
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