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LM25115

Secondary Side Post Regulator Controller

National ->Texas Instruments 

Absolute Maximum Ratings (Note 1)

If Military/Aerospace specified devices are required,

please contact the National Semiconductor Sales Office/

Distributors for availability and specifications.

VBIAS to GND

VCC to GND

HS to GND

VOUT, CS to GND

All other inputs to GND

Storage Temperature Range

Junction Temperature

–0.3V to 32V

–0.3V to 9V

–1V to 45V

– 0.3V to 15V

−0.3V to 7.0V

–55˚C to +150˚C

+150˚C

ESD Rating

HBM (Note 2)

2 kV

Operating Ratings

VBIAS supply voltage

VCC supply voltage

HS voltage

HB voltage

Operating Junction Temperature

5V to 30V

5V to 7.5V

0V to 42V

VCC + HS

–40˚C to +125˚C

Typical Operating Conditions

Parameter

Supply Voltage, VBIAS

Supply Voltage, VCC

Supply voltage bypass, CVBIAS

Reference bypass capacitor, CVCC

HB-HS bootstrap capacitor

SYNC Current Range (VCC = 4.5V)

RAMP Saw Tooth Amplitude

VOUT regulation voltage (VBIAS min = 3V + VOUT)

Min

Typ

4.5

4.5

0.1

1

0.1

1

0.047

50

1

0.75

Max

30

7

10

150

1.75

13.5

Units

V

V

µF

µF

µF

µA

V

V

Electrical Characteristics Unless otherwise specified, TJ = –40˚C to +125˚C, VBIAS = 12V, No Load on

LO or HO.

Symbol

Parameter

Conditions

VBIAS SUPPLY

Ibias VBIAS Supply Current

VCC LOW DROPOUT BIAS REGULATOR

FSYNC = 200kHz

VccReg VCC Regulation

VCC open circuit. Outputs not

switching

VCC Current Limit

(Note 4)

VCC Under-voltage Lockout Voltage Positive going VCC

VCC Under-voltage Hysteresis

SOFT-START

SS Source Impedance

SS Discharge Impedance

ERROR AMPLIFIER and FEEDBACK REFERENCE

VREF FB Reference Voltage

Measured at FB pin

FB Input Bias Current

FB = 2V

COMP Source Current

Open Loop Voltage Gain

GBW Gain Bandwidth Product

Vio

Input Offset Voltage

COMP Offset

Threshold for VHO = high RAMP = CS

= VOUT = 0V

RAMP Offset

Threshold for VHO = high COMP =

1.5V, CS = VOUT = 0V

CURRENT SENSE AMPLIFIER

Current Sense Amplifier Gain

Output DC Offset

Amplifier Bandwidth

Min

6.65

4

0.2

43

0.737

-7

Typ

7

40

0.25

60

100

0.75

0.2

300

60

4

0

2

1.1

16

1.27

500

Max

4

7.15

4.5

0.3

77

0.763

0.5

7

Units

mA

V

mA

V

V

kΩ

Ω

V

µA

µA

dB

MHz

mV

V

V

V/V

V

kHz

5

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