CS51021 Ver la hoja de datos (PDF) - Cherry semiconductor

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componentes Descripción

Fabricante

CS51021

Enhanced Current Mode PWM Controller

Cherry semiconductor 

Electrical Characteristics: Unless otherwise stated, specifications apply for -40°C < TA < 85°C, -40°C < TJ < 150°C,

3V < VC < 20V, 8.2V < VCC < 20V, RT = 12kΩ, CT = 390pF.

PARAMETER

s SLOPE Compensation

Charge Current

COMP Gain

Discharge Voltage

TEST CONDITIONS

SLOPE = 2V

Fraction of slope voltage added

to ISENSE (Note 1)

SYNC = 0V

MIN

TYP

MAX

UNIT

-63

0.095

-53

0.100

0.1

-43

0.105

0.2

µA

V/V

V

s Current Sense

OFFSET Voltage

Blanking Time

Blanking Disable Voltage

Second Current Threshold Gain

ISENSE Input Resistance

Minimum On Time

Gain

(Note 1)

Adjust VFB

GATE High to Low

(Note 1)

0.09

0.10

55

1.8

2

1.21

1.33

5

30

70

0.78

0.80

0.11

V

160

ns

2.2

V

1.45

V/V

kΩ

110

ns

0.82

V/V

s OV & UV Voltage Monitors

OV Monitor Threshold

OV Hysteresis Current

UV Monitor Threshold

UV Monitor Hysteresis

2.4

2.5

-10

-12.5

1.38

1.45

25

75

2.6

V

-15

µA

1.52

V

100

mV

s SOFT START (SS)

Charge Current

Discharge Current

Charge Voltage, VSS

Discharge Voltage, VSS

SS = 2V

SS = 2V

Note 1: Guaranteed by Design, not 100% tested in production.

-70

-55

250

1000

4.4

4.7

0.25

0.27

-40

µA

µA

5

V

0.30

V

PACKAGE PIN #

16L PDIP & SO Narrow

1

2

3

3

Package Pin Description

PIN SYMBOL

FUNCTION

GATE

ISENSE

SYNC

(CS51021/23)

SLEEP

(CS51022/24)

External power switch driver with 1.0A peak capability.

Current sense amplifier input.

Bi-directional synchronization. Locks to the highest frequency.

Active high chip disable. In sleep mode, VREF and GATE are

turned off.

4

SLOPE

Additional slope to the current sense signal. Internal current

source charges the external capacitor.

5

UV

Undervoltage protection monitor.

6

OV

Overvoltage protection monitor.

4

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