LT1725IS Просмотр технического описания (PDF) - Linear Technology

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LT1725IS

General Purpose Isolated Flyback Controller

Linear Technology 

LT1725

ABSOLUTE AXI U RATI GS

(Note 1)

VCC Supply Voltage ................................................. 22V

UVLO Pin Voltage .................................................... VCC

ISENSE Pin Voltage .................................................... 2V

FB Pin Current ..................................................... ±2mA

Operating Junction

Temperature Range

LT1725C .............................................. 0°C to 100°C

LT1725I ........................................... –40°C TO 125°C

Storage Temperature Range ................ – 65°C to 150°C

Lead Temperature (Soldering, 10 sec)................ 300°C

UW U

PACKAGE/ORDER I FOR ATIO

TOP VIEW

PGND 1

ISENSE 2

SFST 3

ROCMP 4

RCMPC 5

OSCAP 6

VC 7

FB 8

16 GATE

15 VCC

14 tON

13 ENDLY

12 MINENAB

11 SGND

10 UVLO

9 3VOUT

GN PACKAGE

S PACKAGE

16-LEAD PLASTIC SSOP 16-LEAD PLASTIC SO

TJMAX = 125°C, θJA = 110°C/W (GN)

TJMAX = 125°C, θJA = 100°C/W (SO)

ORDER PART NUMBER GN PART MARKING

LT1725CGN

LT1725IGN

LT1725CS

LT1725IS

1725

1725I

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.

ELECTRICAL CHARACTERISTICS The ● denotes specifications which apply over the full operating

temperature range, otherwise specifications are at TA = 25°C. VCC = 14V, GATE open, VC = 1.4V unless otherwise noted.

SYMBOL PARAMETER

CONDITIONS

MIN

TYP

MAX

Power Supply

VCC

VCC Turn-On Voltage

VCC Turn-Off Voltage

VCC Hysteresis (Note 3)

ICC

Supply Current

Start-Up Current

(VTURN-ON – VTURN-OFF)

VC = Open

● 14.0

15.1

16.0

●8

9.7

11

● 4.0

5.4

6.5

●6

●

10

15

120

280

Feedback Amplifier

VFB

Feedback Voltage

1.230

● 1.220

1.245

1.260

1.270

IFB

gm

ISRC, ISNK

VCL

Feedback Pin Input Current

Feedback Amplifier Transconductance

Feedback Amplifier Source or Sink Current

Feedback Amplifier Clamp Voltage

Reference Voltage/Current Line Regulation

Voltage Gain

Soft-Start Charging Current

Soft-Start Discharge Current

∆lC = ±10µA

12V ≤ VIN ≤ 18V

VC = 1V to 2V

VSFST = 0V

VSFST = 1.5V, VUVLO = 0V

● 400

● 30

●

25

0.8

500

1000

1800

50

80

2.5

0.01

0.05

2000

40

50

1.5

UNITS

V

V

V

mA

µA

V

V

nA

µmho

µA

V

%/V

V/V

µA

mA

1725fa

2

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