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AP3503E PDF даташит

Спецификация AP3503E изготовлена ​​​​«BCD» и имеет функцию, называемую «3A Synchronous DC-DC Buck Converter».

Детали детали

Номер произв AP3503E
Описание 3A Synchronous DC-DC Buck Converter
Производители BCD
логотип BCD логотип 

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AP3503E Даташит, Описание, Даташиты
Preliminary Datasheet
340kHz, 3A Synchronous DC-DC Buck Converter
AP3503E
General Description
The AP3503E is a 340kHz fixed frequency, current
mode, PWM synchronous buck (step-down) DC-DC
converter, capable of driving a 3A load with high
efficiency, excellent line and load regulation. The
AP3503E exhibits high efficiency at light load. The
device integrates N-channel power MOSFET
switches with low on-resistance. Current mode
control provides fast transient response and
cycle-by-cycle current limit.
The AP3503E employs complete protection to ensure
system security. Including output Over Voltage
Protection, input Under Voltage Lock Out,
programmable Soft Start, Over Temperature
Protection and hiccup mode Short Circuit Protection.
This IC is available in PSOP-8 package.
Features
• Input Voltage Range: 4.5V to 18V
• Fixed 340kHz Frequency
• High Efficiency at Light Load
• High Efficiency: up to 95%
• Output Current: 3A
• Current Mode Control
• Built-in Over Current Protection
• Built-in Thermal Shutdown Function
• Built-in UVLO Function
• Built-in Over Voltage Protection
• Programmable Soft-start
• Hiccup Mode SCP
Applications
• LCD TV
• Set Top Box
• Portable DVD
• Digital Photo Frame
May. 2012 Rev. 1. 6
PSOP-8
Figure 1. Package Type of AP3503E
BCD Semiconductor Manufacturing Limited
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AP3503E Даташит, Описание, Даташиты
Preliminary Datasheet
340kHz, 3A Synchronous DC-DC Buck Converter
AP3503E
Pin Configuration
MP Package
(PSOP-8)
18
27
36
45
Pin Description
Figure 2. Pin Configuration of AP3503E (Top View)
Pin Number
1
2
3
4
5
6
7
8
Pin Name
BS
IN
SW
GND
FB
COMP
EN
SS
EP
Function
Bootstrap pin. A bootstrap capacitor is connected between the BS pin
and SW pin. The voltage across the bootstrap capacitor drives the
internal high-side power MOSFET
Supply power input pin. A capacitor should be connected between the
IN pin and GND pin to keep the input voltage constant
Power switch output pin. This pin is connected to the inductor and
bootstrap capacitor
Ground pin
Feedback pin. This pin is connected to an external resistor divider to
program the system output voltage. When the FB pin voltage exceeds
1.1V, the over voltage protection is triggered. When the FB pin
voltage is below 0.3V, the oscillator frequency is lowered to realize
short circuit protection
Compensation pin. This pin is the output of the transconductance
error amplifier and the input to the current comparator. It is used to
compensate the control loop. Connect a series RC network from this
pin to GND. In some cases, an additional capacitor from this pin to
GND pin is required
Control input pin. EN is a digital input that turns the regulator on or
off. Drive EN high/low to turn on/off the regulator. Pull up with
100kresistor for automatic startup
Soft-start control input pin. SS controls the soft-start period. Connect
a capacitor from SS to GND to set the soft-start period. A 0.1µF
capacitor sets the soft-start period to 15ms. To disable the soft-start
feature, leave SS unconnected
Exposed pad. It should be connected to GND in PCB layout
May. 2012 Rev. 1. 6
BCD Semiconductor Manufacturing Limited
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AP3503E Даташит, Описание, Даташиты
Preliminary Datasheet
340kHz, 3A Synchronous DC-DC Buck Converter
AP3503E
Functional Block Diagram
IN 2
SHUTDOWN
1.5V COMPARATOR
INTERNAL
REGULATOR
0.3V
SCP
OSCILLATOR
90K/ 340K
VA
VB
SLOP
COMP
CURRENT
SENSE
AMPLIFIER
+
7
EN
LOCK
COMPARATOR
CLK
SQ
RQ
PWM
COMPARATOR
2. 5V
VB
SS 8
5A
EA
5 0. 925V
FB
6
COMP
1.1V
Figure 3. Functional Block Diagram of AP3503E
VA
1 BS
M1
3
SW
M2
4
GND
Ordering Information
AP3503E
-
Circuit Type
Package
MP: PSOP-8
G1: Green
TR: Tape & Reel
Blank: Tube
Package
PSOP-8
Temperature
Range
-40 to 85°C
Part Number
AP3503EMP-G1
AP3503EMPTR-G1
Marking ID
3503EMP-G1
3503EMP-G1
Packing Type
Tube
Tape & Reel
BCD Semiconductor's Pb-free products, as designated with "G1" suffix in the part number, are RoHS
compliant and green.
May. 2012 Rev. 1. 6
BCD Semiconductor Manufacturing Limited
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