APE1723 Datasheet, PDF (1/10 Pages) Advanced Power Electronics Corp. – 200KHz, 1A PWM BUCK DC/DC CONVERTER

Advanced Power
Electronics Corp.
APE1723
200KHz, 1A PWM BUCK DC/DC CONVERTER
FEATURES
Output Voltage : Adjustable Output Version.
Adjustable Version Output Voltage Range :
0.745V to 24V.
200KHz Fixed Switching Frequency.
Thermal-shutdown and Current-limit Protection.
ON/OFF Shutdown Control Input.
Short Circuit Protect (SCP).
Operating Voltage can be up to 26V.
Output Load Current : 1A.
Low Power Standby Mode.
Built-in Switching Transistor on Chip.
SOT-23-5L and SO-8 packages.
DESCRIPTION
The APE1723 series are monolithic IC designed for a
step-down DC/DC converter, and own the ability of driving a
1A load without additional transistor. It saves board space.
The external shutdown function can be controlled by logic
level and then come into standby mode. The internal
compensation makes feedback control having good line and
load regulation without external design. Regarding protected
function, thermal shutdown is to prevent over temperature
operating from damage, and current limit is against over
current operating of the output switch. If the APE1723’s VFB
is down below 0.5V, the switching frequency will be reduced.
The APE1723 operates at a switching frequency of 200KHz
thus allow smaller sized filter components. Other features
include a guaranteed +3% tolerance on output voltage under
specified input voltage and output load conditions, The chips
are available in SOT-23-5L and SO-8 packages.
TYPICAL APPLICATION
VIN=12V
C1
100uF
R3
C2 ^100k
0.1uF
C4
0.1uF
U1
5
APE1723
VIN SW
1
4 _{EN FB} 3
ON/OFF ^{2 Vss}
L1
(Refer table)
D1
B140A
Vout=5V/1A
R1
6.8K
C3 C6
220uF 0.1uF ^R2
1.2K
V_OUT = V_FB x (1+R1/R2) , V_FB= 0.745V, R2 = 0.75K ~4 K
Table 1 Resistor select for output voltage setting
V_OUT
R2
R1
5V
1.2K
6.8K
3.3V
2.4K
8.2K
2.5V
2K
4.7K
1.8V
3.3K
4.7K
1.5V
2K
2K
1.3V
2K
1.5K
1.2V
2K
1.2K
V_OUT
L1 Value
L1 recommend value (V_IN=12V, I_OUT=1A)
1.8V
2.5V
3.3V
33uH
33uH
47uH
5V
47uH
Data and specifications subject to change without notice
1
200812231