TOP250 datasheet(2/6 Pages) KEXIN

2 / 6 page

SMD Type

Integrate Circuit

www.kexin.com.cn

■ Electrical Characteristics (Tj = -40 to 125 ℃,SOURCE = 0 V,unless otherwise specified)

Parameter

Symbol

Test conditons

Min

Typ

Max

Unit

IC = 3 mA, Tj = 25℃(FREQUENCY

Pin Connected to SOURCE)

124

132

140

IC = 3 mA, Tj = 25℃(FREQUENCY

Pin Connected to CONTROL)

61.5

70.5

Duty Cycle at ONSET of Frequency Reduction

DC(ONSET)

IC = ICD1 + 0.4 mA

Switching Frequency near 0% Duty Cycle

fOSC (DMIN)

132 kHz Operation

66 kHz Operation

kHz

Frequency Jitter Deviation

Δf

132 kHz Operation

66 kHz Operation

± 4

± 2

kHz

Frequency Jitter Modulation Rate

250

Maximum Duty Cycle (IL ≤ IL (DC) or IM ≤ IM(DC))

(IL or IM = 190 μA)

Soft Start Time

tSOFT

TJ = 25 ℃; DCMIN to DCMAX

PWM Gain

DCreg

Ic = 4 mA; Tj = 25 ℃

-28

-23

-18

%/mA

PWM Gain Temperature Drift

-0.01

%/mA/℃

External Bias Current

1.7

2.7

4.2

CONTROL Current at 0% Duty Cycle

lC(OFF)

7.3

8.5

Dynamic Impedance

Ic = 4 mA; Tj = 25 ℃

Dynamic Impedance Temperature Drift

0.18

%/℃

Control Pin Internal Filter Pole

kHz

VC = 0 V

-5.0

-3.5

-2.0

VC = 5 V

-3.0

-1.8

-0.6

Charging Current Temperature Drift

0.5

%/℃

Auto-restart Upper Threshold Voltage

VC(AR)U

5.8

Auto-restart Lower Threshold Voltage

VC(AR)L

4.5

4.8

5.1

Auto-restart Hysteresis Voltage

VC(AR)hyst

0.8

1.0

Auto-restart Duty Cycle

DC(AR)

Auto-restar Frequency

f(AR)

1.0

Line Under-Voltage Threshold Current and

Hysteresis (M or L Pin)

lUV

Threshold

Hysteresis

μA

Line Over-Voltage or Remote ON/OFF Threshold

Current and Hysteresis (M or L Pin)

IOV

Threshold

Hysteresis

210

225

240

μA

L Pin Voltage Threshold

VL(TH)

0.5

1.0

1.6

Remote ON/OFF Negative Threshold Current and

Hysteresis (M or X Pin)

IREM (N)

Threshold

Hysteresis

-35

-27

-20

μA

L or M Pin Short Circuit Current

IL (SC) or

IM (SC)

VL, VM = VC

300

400

520

μA

X or M Pin Short Circuit Current

IX (SC) or

IM (SC)

VX, VM = 0 V

-300

-240

-180

μA

L or M Pin Voltage (Positive Current)

VL, VM

lL or lM = 50 μA

lL or lM = 225 μA

1.9

2.3

2.5

2.9

3.0

3.3

X Pin Voltage (Negative Current)

lX = -50 μA

lX = -150 μA

1.26

1.18

1.33

1.24

1.4

1.3

M Pin Voltage (Negative Current)

lX = -50 μA

lX = -150 μA

1.24

1.13

1.31

1.19

1.39

1.25

fOSC

kHz

Output Frequency (average)

DCMAX

IC = ICD1

lC (CH)

Control Pin Charging Current

TOP250

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