FAN5234 查看數據表（PDF） - Fairchild Semiconductor

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FAN5234

Mobile-Friendly PWM/PFM Controller

Fairchild Semiconductor 

PRODUCT SPECIFICATION

FAN5234

Electrical Specifications Recommended operating conditions, unless otherwise noted.

Parameter

Conditions

Power Supplies

VCC Current

LDRV, HDRV Open, VSEN forced

above regulation point

Shut-down (EN=0)

VIN Current - Sinking

VIN pin = input voltage source

VIN Current - Sourcing

VIN pin = GND

VIN Current - Shut-down

UVLO Threshold

Rising VCC

Falling

Hysteresis

Oscillator

Frequency

VIN > 5V

VIN = 0V

Ramp Amplitude, pk–pk

VIN = 16V

Ramp Amplitude, pk–pk

VIN < 5V

Ramp Offset

Ramp / VIN Gain

VIN > 3V

Ramp / VIN Gain

1V < VIN < 3V

Reference and Soft Start

Internal Reference Voltage

Soft Start current (ISS)

Soft Start Complete Threshold

at start-up

PWM Converter

Load Regulation

VSEN Bias Current

IOUT from 0 to 3A, VIN from 2 to 24V

VOUT pin input impedance

Under-voltage Shutdown

as % of set point. 2µS noise filter

ISNS Over-Current threshold

Over-voltage threshold

RILIM = 68.5KΩ. See Figure 4

as % of set point. 2µS noise filter

Output Driver

HDRV Output Resistance

Sourcing

Sinking

LDRV Output Resistance

Sourcing

Sinking

PGOOD (Power Good Output) and Control pins

Lower Threshold

as % of set point, 2µS noise filter

Upper Threshold

as % of set point, 2µS noise filter

PGOOD Output Low

Leakage Current

Soft Start Voltage when PGOOD

Enabled

IPGOOD = 4mA

VPULLUP = 5V

EN, FPWM Inputs

Input High

Input Low

Min. Typ. Max. Units

850 1300 µA

5

15 µA

10

20

30 µA

7

15

20 µA

1

µA

4.3 4.55 4.75 V

4.1 4.27 4.5

V

0.1

0.5

V

255 300 345 KHz

510 600 690 KHz

2

V

1.25

V

0.5

V

125

mV/V

250

mV/V

0.891 0.9 0.909 V

5

µA

1.5

V

-1

+1

%

50

80 120 nA

40

55

65 KΩ

70

75

80

%

115 144 172 µA

113

120 %

8

15

Ω

3.2

4

Ω

8

15

Ω

1.5

2.4

Ω

86

92

%

110

115 %

0.5

V

1

µA

1.5

V

2

V

0.8

V

4

REV. 1.0.10 5/3/04

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