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LM5025A

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SNVS293F – DECEMBER 2004 – REVISED AUGUST 2016

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Electrical Characteristics (continued)

Typical limits are for TJ = 25°C, and minimum and maximum limits apply over the operating junction temperature range

(–40°C to 125°C). VIN = 48 V, VCC = 10 V, RT = 31.3 kΩ, RSET = 27.4 kΩ) unless otherwise stated

(1)

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

SOFT-START

Soft-start current source

normal

TJ = 25°C

22

µA

over full operating junction temperature

17

27

Soft-start current source

following a CS2 event

TJ = 25°C

1

µA

over full operating junction temperature

0.5

1.5

OSCILLATOR

Frequency1

TA = 25°C,

180

200

220

kHz

TJ = Tlow to Thigh

175

225

Frequency2

RT = 10.4 kΩ

TA = 25°C,

580

kHz

TJ = Tlow to Thigh

510

650

Sync threshold

2

V

Min sync pulse width

TJ = Tlow to Thigh

100

ns

Sync frequency range

TJ = Tlow to Thigh

160

kHz

PWM COMPARATOR

Delay to output

COMP step 5 V to 0 V,

Time to onset of OUT_A transition low

40

ns

Duty cycle range

TJ = Tlow to Thigh

0%

80%

COMP to PWM offset

TA = 25°C,

1

V

TJ = Tlow to Thigh

0.7

1.3

COMP open-circuit voltage

TJ = Tlow to Thigh

4.3

5.9

V

COMP short-circuit current

COMP = 0 V

TA = 25°C,

1

mA

TJ = Tlow to Thigh

0.6

1.4

VOLT × SECOND CLAMP

Ramp clamp level

Delta RAMP

measured from onset

of OUT_A to Ramp

peak,

COMP = 5 V

TA = 25°C,

2.5

V

TJ = Tlow to Thigh

2.4

2.6

UVLO SHUTDOWN

Undervoltage shutdown

threshold

TA = 25°C,

2.5

V

TJ = Tlow to Thigh

2.44

2.56

Undervoltage shutdown

hysteresis

TA = 25°C,

20

µA

TJ = Tlow to Thigh

16

24

OUTPUT SECTION

OUT_A high saturation

MOS device at

Iout = –10 mA

TA = 25°C,

5

Ω

TJ = Tlow to Thigh

10

OUTPUT_A peak current

sink

Bipolar Device at Vcc/2

3

A

OUT_A low saturation

MOS device at

Iout = 10 mA

TA = 25°C,

6

Ω

TJ = Tlow to Thigh

9

OUTPUT_A rise time

Cgate = 2.2 nF

20

ns

OUTPUT_A fall time

Cgate = 2.2 nF

15

ns

OUT_B high saturation

MOS device at

Iout = –10 mA

TA = 25°C,

10

Ω

TJ = Tlow to Thigh

20

OUTPUT_B peak current

sink

Bipolar device at Vcc/2

1

A