LTC3725EMSE datasheet(3/20 Pages) LINER

Part #	LTC3725EMSE

Description	Single-Switch Forward Controller and Gate Driver

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Manufacturer	LINER [Linear Technology]

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LTC3725

3

3725f

The

● denotes the specifications which apply over the full operating

temperature range, otherwise specifications are at TA = 25°C. VCC = 12V, GND = PGND = 0V, TA = 25°C, unless otherwise noted.

ELECTRICAL CHARACTERISTICS

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

Undervoltage Lockout (UVLO)

VUVLOR

Undervoltage Lockout Threshold Rising

Rising

●

1.220

1.242

1.280

V

VUVLOF

Undervoltage Lockout Threshold Falling

Falling

●

1.205

1.226

1.265

V

IHUVLO

Hysteresis Current

VUVLO = 1V

●

4.2

4.9

5.6

µA

VUVLOOP

Voltage Feedforward Operating Range

Primary-Side Control

VUVLOF(MIN)

3.75

V

Gate Driver (GATE)

ROS

Output Pull-Down Resistance

IOUT = 100mA

1.9

Ω

VOH

High Output Voltage

IOUT = –100mA

11

V

IPU

Peak Pull-Up Current

1.7

A

tr

Output Rise Time

10% to 90%, COUT = 4.7nF

40

ns

tf

Output Fall Time

10% to 90%, COUT = 4.7nF

70

ns

Rectifier

IRECT

Maximum Rectifier DC Output Current

25

mA

Oscillator

fOSC(P)

Oscillator Frequency

Primary-Side Control, RFS(P) = 100kΩ

200

kHz

Primary-Side Control, RFS(P) = 25kΩ

700

kHz

Primary-Side Control, RFS(P) = 300kΩ

70

kHz

∆fRFS(P)

Oscillator Resistor Set Accuracy

Primary-Side Control

25k < RFSET < 300k

±15

%

fOSC(S)

Oscillator Frequency

Secondary-Side Control (During Start-Up),

300

kHz

RFS(S) = 100kΩ

Soft-Start/Fault (SSFLT)

ISS(C)

Soft-Start Charge Current

Primary-Side Control, VSSFLT = 2V

–5.2

µA

Secondary-Side Control, VUVLO = 1.3V,

–4

µA

VSSFLT = 2V

Secondary-Side Control, VUVLO = 3.75V,

–1.6

µA

VSSFLT = 2V

VLRTO

Linear Regulator Time Out-Threshold

3.9

V

VFLTH

Fault Output High

VCC = 8V

6.7

V

ISS(D)

Soft-Start Discharge Current

Timing Out After Fault, VSSFLT = 2V

1

µA

Current Sense Input (IS)

VIS(MAX)

Overcurrent Threshold

300

mV

Volt Second Limit (VSLMT)

VVSL(MAX)

Volt-Second Limit Threshold

1.26

V

IVSLMT(MAX)

Maximum Volt-Second Limit Resistor Current

0.25

mA

Optoisolator Bias Current

VOPTO

Open Circuit Optoisolator Voltage

Primary-Side Control IFB = 0V

3.3

V

IOPTO

Optoisolator Bias Current

Primary-Side Control VFB = 2.5V

0.5

mA

Primary-Side Control VFB = 0V

1.6

mA

Note 1: Absolute Maximum Ratings are those values beyond which the life

of a device may be impaired.

Note 2: Operating junction temperature TJ (in °C) is calculated from the

ambient temperature TA and the average power dissipation PD (in watts)

by the formula: TJ = TA + θJA • PD. Refer to the Applications Information

section for details.

Note 3: ICC is the sum of current into NDRV and VCC.

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