SG6846ACSY 查看數據表（PDF） - Fairchild Semiconductor

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SG6846ACSY

Highly Integrated Green-Mode PWM Controller

Fairchild Semiconductor 

Frequency

+4.2 KHz

65KHz

-4.2 KHz

+1. 45KHz

22 .5KHz

-1. 45KHz

PW M

Frequency

V FB-G

V FB-N

VFB

Figure 7. PWM Frequency

Electrical Characteristics (Continued)

VDD = 15V and TA = 25°C unless otherwise noted.

Symbol

Parameter

Test Condition Min. Typ. Max. Unit

PWM Output Section

DCYMAX

VOL

VOH

tR

tF

Maximum Duty Cycle

Output Voltage Low

Output Voltage High

Rising Time

Falling Time

80

85

90

VDD = 15V, IO = 50mA

1.5

VDD = 12V, IO = 50mA 8

GATE = 1nF

350

GATE = 1nF

50

VCLAMP Gate Output Clamping Voltage

VDD = 20V

18

Over-Temperature Protection (OTP) Section(1)

IRT

VRTTH

Output Current of RT Pin

Threshold Voltage for OTP

RI = 26kΩ

64

70

76

1.015 1.065 1.115

tDOTP-LATCH Over-Temperature Latch-off Debounce

RRT-OFF Equivalent Impedance of RT for OTP(1)

RI = 26kΩ

RI = 26kΩ

100

14

15

16

RI Section

RINOR

RI Operating Range

13

36

RIMAX Maximum RI Value for Protection

10

RIMIN

Minimum RI Value for Protection

6

Note:

1. The relationship between RRT-OFF and RI is: RRT-OFF = VOTP-LATCH-OFF / IRT = VRT / (70μA × 26 / RI (KΩ))

%

V

V

ns

ns

V

µA

V

ms

kΩ

kΩ

MΩ

kΩ

(1)

© 2008 Fairchild Semiconductor Corporation

SG6846A • Rev. 1.1.4

8

www.fairchildsemi.com

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