ap1510 Diodes, Inc., ap1510 Datasheet - Page 7

• Manufacturer Part Number: ap1510
• Description: Pwm Control 3a Step-down Converter
• Manufacturer: Diodes, Inc.

Function Description
PWM Control
The AP1510 is a DC/DC converter that employs pulse width
modulation (PWM) scheme. Its pulse width varies in the range of
0% to 99%, based on the output current loading. The output
ripple voltage caused by the PWM high frequency switching can
easily be reduced through an output filter. Therefore, this
converter provides a low ripple output supply over a broad range
of input voltage & output current loading
Under Voltage Lockout
The under voltage lockout circuit of the AP1510 assures that the
high-side MOSFET driver remains in the off state whenever the
supply voltage drops below 3.3V. Normal operation resumes
once V
Current Limit Protection
The current limit threshold is set by external resistor R
connected from V
current I
at OCSET pin. When the PWM voltage is less than the voltage at
OCSET, an over-current condition is triggered.
Marking Information
AP1510 Rev. 5
CC
OCSET
rises above 3.5V.
(90uA typical) across this resistor sets the voltage
CC
supply to OCSET pin. The internal sink
Part No.
Logo
( Top View )
YY WW X X
AP1510
8
1
www.diodes.com
SOP-8L
OCSET
PWM CONTROL 3A STEP-DOWN CONVERTER
7 of 8
5
4
The current limit threshold is given by the following equation:
where,
I
resistance. F
inductor value will affect the ripple current ΔI.
The above equation is recommended for input voltage range of
5V to 18V. For input voltage lower than 5V, higher than 18V or
ambient temperature over 100°C, high R
The maximum R
current output.
PEAK
is the output peak current; R
I
S
PEAK
Internal code
Xth week : 01~52
Year : "07" = 2007
Blank : Lead Free
G : Green
is the PWM frequency (300KHz typical). Also, the
OCSET
Δ
I
PEAK
×
I
R
=
value should not exceed AP1510 maximum
DS(ON)
V
"08" = 2008
>
IN
I
F
OUT
−
S
xL
=
V
(MAX)
OUT
I
OCSET
DS (ON)
x
+
V
OCSET
×
V
(
OUT
Δ
R
2
IN
©
is the MOSFET ON
AP1510
I)
OCSET
is recommended.
Diodes Incorporated
MARCH 2008