LT3752MPFE#PBF datasheet(7/52 Pages) AD

7 / 52 page

LT3752/LT3752-1

Rev. C

For more information www.analog.com

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

OUT High Level

INTVCC = 12V

11.9

OUT Low Level in Shutdown

UVLO_VSEC = 0V, INTVCC = 8V, IOUT = 1mA Into

the Pin

0.25

OUT (Volt-Sec) Max Duty Cycle Clamp

DVSEC (1 • System Input (Min)) × 100

DVSEC (2 • System Input (Min)) × 100

DVSEC (4 • System Input (Min)) × 100

RT = 24.9k, RIVSEC = 51.1k, FB = 1V, SS1 = 2.7V

UVLO_VSEC = 1.25V

UVLO_VSEC = 2.50V

UVLO_VSEC = 5.00V

68.5

34.3

17.5

72.5

36.5

18.6

76.2

38.7

19.7

OUT Minimum ON Time

COUT = 3.3nF, INTVCC = 12V (Note 9)

RTBLNK = 14.7k

RTBLNK = 73.2k (Note 16)

325

454

SS1 Pin (Soft-Start: Frequency and DVSEC) (Soft-Stop: COMP Pin, Frequency and DVSEC)

SS1 Reset Threshold (VSS1(RTH))

150

SS1 Active Threshold (VSS1(ACT))

(Allow Switching)

1.25

SS1 Charge Current (Soft-Start)

SS1 = 1.5V (Note 10)

11.5

µA

SS1 Discharge Current (Soft-Stop)

SS1 = 1V, UVLO_VSEC = VSYS_UV – 50mV

6.4

10.5

14.6

µA

SS1 Discharge Current (Hard Stop)

OC > OC Threshold

INTVCC < INTVCC UVLO(–)

OVLO > OVLO(+)

SS1 = 1V

0.9

SS2 Pin (Soft-Start: Comp Pin)

SS2 Discharge Current

SS1 < VSS(ACT), SS2 = 2.5V

2.8

SS2 Charge Current

SS1 > VSS(ACT), SS2 = 1.5V

µA

Error Amplifier (Housekeeping Controller)

HFB Reference Voltage

0.90

1.000

1.10

HFB Line Reg

6.5V < VIN < 100V (LT3752)

10.5V < VIN < 16V (LT3752-1)

0.1

mV/V

HFB Load Reg

HCOMP VSW – 0.1V < HCOMP < HCOMP VOH –

0.1V

–6

mV/V

HFB Input Bias Current

HFB = 1.1V (Note 10)

170

Transconductance

∆IHCOMP ±5µA

250

µS

Voltage Gain

175

V/V

Power Good(+) (HFB Level)

0.96

Power Good(–) (HFB Level)

0.92

HFB OVLO(+)

(Disable HOUT Switching)

1.206

HFB OVLO(–)

(Enable Housekeeping Operation)

1.150

HCOMP Source Current

HCOMP = 1.75V (Note 10)

µA

HCOMP Sink Current

HCOMP = 1.75V

µA

HCOMP Output High Clamp

2.9

HCOMP Switching Threshold

1.28

Current Sense (Housekeeping Controller)

HISENSE Peak Current Threshold

HFB = 0.8V

86.5

HCOMP Current Mode Gain

∆VHCOMP/∆VHISENSE

9.1

V/V

HISENSE Input Current (D = 0%)

HISENSE Input Current (D = 80%)

(Note 10)

µA

HISENSE Overcurrent Threshold

84.6

105.4

ELECTRICAL CHARACTERISTICS The

denotes the specifications which apply over the full operating

temperature range, otherwise specifications are at TA = 25°C. VIN = 12V, UVLO_VSEC = 2.5V.

LT3752MPFE#PBF Datasheet(PDF) 7 Page - Analog Devices

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