AP1534

PWM CONTROL 2A STEP-DOWN CONVERTER

AP1534 Rev. 5

4 of 10

FEBRUARY 2009

www.diodes.com

Electrical Characteristics

Symbol

Parameter

Conditions

Min

Typ.

Max

Unit

Feedback Voltage

0.784

0.8

0.816

V

Feedback Bias Current

-

0.1

0.5

µA

Switch Current

--

2.0

-

-

A

Current Consumption During

Power Off

-

10

-

µA

∆V

OUT

Line Regulation

-

1

2

%

∆V

OUT

Load Regulation

-

0.2

0.5

%

Oscillation Frequency

Measure waveform at SW pin

240

300

400

KHz

Frequency of Current Limit

or Short Circuit Protect

Measure waveform at SW pin

-

50

-

KHz

EN Pin Input Voltage

Evaluate oscillation at SW pin

2.0

-

-

V

Evaluate oscillation stop at SW pin

-

-

0.8

EN Pin Input Leakage

Current

--

-

20

-

µA

--

-

-10

-

µA

OCSET Pin Bias Current

--

75

90

105

µA

-

160

-

m

Ω

-

100

-

EFFI

Efficiency

-

91

-

%

Thermal shutdown threshold

-

150

-

°C

Thermal shutdown

hysteresis

-

55

-

°C

θ

JA

Thermal Resistance

Junction-to-Ambient

SOP-8L (Note 3)

-

127

-

θ

JC

Thermal Resistance

Junction-to-Case

SOP-8L (Note 3)

-

28

-

Notes:

3. Test condition for SOP-8L: Device mounted on FR-4 substrate PC board, 2oz copper, with minimum recommended pad layout.

For better thermal performance, larger copper pad for heatsink is needed.

Typical Application Circuit

AP1534

+

-

V

SS

EN

C

C

R

A

R

B

B240A

FB

Vcc

Output

CVcc

V

OUT

=5V/2A

R

OCSET

OCSET

C

OUT

C

IN

Optional

C

OCSET

C

EN

R

EN

Option

100K

Note: V

R

L1

22uH

6.8K

1.3K

5.6K

0.1uF

+

-

C

0.1uF

470uF

470uF

0.1uF

(Note 4)

D1

Notes:

4. Suggested DIODES Power Schottky P/N: B240/B340 series.