US3012/3012A

4-3

Rev. 1.0

5/6/98

UVLO Section

UVLO Threshold-12V

Supply ramping up

9.2

10

10.8

V

UVLO Hysterises-12V

0.3

0.4

0.5

V

UVLO Threshold-5V

Supply ramping up

4.1

4.3

4.5

V

UVLO Hysterises-5V

0.2

0.3

0.4

V

Error Comparator Section

Input bias current

2

uA

Input Offset Voltage

-2

+2

mV

Delay to Output

Vdiff=10mV

100

nS

Current Limit Section

C.S Threshold Set Current

160

200

240

uA

C.S Comp Offset Voltage

-5

+5

mV

Hiccup Duty Cycle

Css=0.1 uF

2

%

Supply Current

Operating Supply Current

CL=3000pF

V5

20

V12

14

mA

Output Drivers Section

Rise Time

CL=3000pF

70

100

nS

Fall Time

CL=3000pF

70

130

nS

Dead band Time

CL=3000pF

100

200

300

nS

Oscillator Section

Osc Frequency

Ct=150pF

190

220

250

Khz

Osc Valley

0.2

V

Osc Peak

V5

V

Output Enable Section

Pull up Resistor to V5

35

k

Ω

HI Threshold Voltage

2

V

LO Threshold Voltage

0.8

V

Note 1: Vs refers to the set point voltage given in Table 1.

D4

D3

D2

D1

D0

Vs

D4

D3

D2

D1

D0

Vs

0

1

1

1

1

1.30*

1

1

1

1

1

**

0

1

1

1

0

1.35*

1

1

1

1

0

2.1

0

1

1

0

1

1.40*

1

1

1

0

1

2.2

0

1

1

0

0

1.45*

1

1

1

0

0

2.3

0

1

0

1

1

1.50*

1

1

0

1

1

2.4

0

1

0

1

0

1.55*

1

1

0

1

0

2.5

0

1

0

0

1

1.60*

1

1

0

0

1

2.6

0

1

0

0

0

1.65*

1

1

0

0

0

2.7

0

0

1

1

1

1.70*

1

0

1

1

1

2.8

0

0

1

1

0

1.75*

1

0

1

1

0

2.9

0

0

1

0

1

1.80

1

0

1

0

1

3.0

0

0

1

0

0

1.85

1

0

1

0

0

3.1

0

0

0

1

1

1.90

1

0

0

1

1

3.2

0

0

0

1

0

1.95

1

0

0

1

0

3.3

0

0

0

0

1

2.00

1

0

0

0

1

3.4

0

0

0

0

0

2.05

1

0

0

0

0

3.5

* Output voltage is disabled for US3012A.

** Output voltage is disabled for all versions.

Table 1 - Set point voltage vs. VID codes