8

• RH5RH303B

Symbol

Item

Output Voltage

Input Voltage

Vstart

Start-up Voltage

Vhold

Hold-on Voltage

η

Efficiency

Supply Current 1

Supply Current 2

Lx Switching Current

Lx Leakage Current

EXT “H” Output Current

EXT “L” Output Current

CE “H” Level 1

CE “L” Level 1

CE “H” Level 2

CE “L” Level 2

CE “H” Input Current

CE “L” Input Current

fosc

Oscillator Frequency

Maxdty

Oscillator Maximum Duty

Cycle

Soft-Start Time

Conditions

MIN.

TYP.

MAX.

Unit

Note

2.925

3.000

3.075

V

8V

→2V

0.8

0.9

V

→0V

0.7

V

70

85

%

To be measured at OUT pin

30

50

µA

To be measured at OUT pin

25

µA

60

mA

0.5

µA

–1.5

mA

1.5

mA

≥1.5V

V

≥1.5V

0.4

V

0.8V

V

0.8V

0.1

V

CE=3V

0.5

µA

CE=0V

–0.5

µA

80

100

120

kHz

70

80

90

%

Time required for the rising

0.5

2.0

ms

Note1

Lx Switch ON

0.65

0.8

1.0

V

Note2

Application (FIG. 3).

(Note 1) Soft-Start Circuit is operated in the following sequence :

(3) The output of Error Amp. is raised to “H” level during the maintenance of the voltage (Vref) of the reference voltage unit.

(4) After the rise of Vref, the output of Internal Error Amp. is gradually decreased to an appropriate value by the function of Internal Phase Com

pensation Circuit, and the Output Voltage is gradually increased in accordance with the gradual decrease of the output of Internal Error Amp.

Lx Switch is turned OFF by an Lx Switch Protection Circuit.

RH5RH