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52KHz, 2A PWM Buck DC/DC Converter GENERAL DESCRIPTION
The AX3007B ries are monolithic IC designed for a step-down DC/DC converter, and own the ability of driving a 2A 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 current limit function occurs and V FB is down below 0.5V, the switching frequency will be reduced.
The AX3007B ries operates at a switching frequency of 52KHz thus allow smaller sized filter components than what would be needed with lower frequency switching regulators.
The output version included fixed 3.3V, 5V, 12V, and an adjustable type. The chips are available in standard SOP-8L, SOP-8L-EP, TO252-5L and TO263-5L packages.
FEATURES
-Output voltage: 3.3V, 5V, 12V and adjustable output version.
-Adjustable version output voltage range, 1.23V to 38.5V.
-52KHz fixed switching frequency.
-Voltage mode non-synchronous PWM control.
-Thermal-shutdown and current-limit protection.
-ON/OFF shutdown control input.
-Short Circuit Protect (SCP).
-Operating voltage can be up to 40V.
-Output load current: 2A.
-SOP-8L, SOP-8L with Expod Pad and TO252-5L, TO263-5L Pb-Free packages.
-Low power standby mode.
-
Built-in switching transistor on chip.
BLOCK DIAGRAM
Vss
蜡笔小新图片壁纸SW V CC
PIN ASSIGNMENT
The packages of AX3007B are SOP-8L, SOP8-EP, TO252-5L and TO263-5L the pin assignment is given by:
TO263-5L ( Side View )
ABSOLUTE MAXIMUM RATINGS
Characteristics Symbol Rating Unit Maximum Supply Voltage V CC +45 V ON/OFF Pin Input Voltage V EN-0.3 to 40 V Feedback Pin Voltage V FB-0.3 to 20 V
Output Voltage to Ground V OUT -0.8 V Power Dissipation Internally limited PD ( T J-T A ) / θJA W Storage Temperature Range T ST-65 to +150 °C Operating Junction Temperature Range T J-40 to +125 °C Operating Supply Voltage V OP+4.5 to +40 V
Thermal Resistance from Junction to ca
SOP-8L
θJC
20
°C/W SOP-8L-EP 15
TO252-5L 8 TO263-5L 3.5
Thermal Resistance from Junction to ambient
SOP-8L
θJA
60
°C/W SOP-8L-EP 50
TO252-5L 35 TO263-5L 25
Note: θJA is measured with the PCB copper area(need connect to V SS pins) of approximately 1.5 in2 (Multi-layer).
ELECTRICAL CHARACTERISTICS
(Unless otherwi specified, T A=25°C, V CC=12V for 3.3V, 5V, adjustable version and
V CC=18V for the 12V version. I LOAD = 0.2A)
Characteristics Symbol Conditions Min Typ Max Units
Quiescent Current I Q V FB=1.5V for Adjustable
version force driver off - 4 8 mA
Feedback bias current I FB V FB=1.3V
(Adjustable version only) - -10 -50 nA
Shutdown supply Current I SD EN pin=5V
V CC=40V - 100 200 uA
Oscillator frequency F OSC 40
52
65
KHz
Oscillator frequency of short circuit protect F SCP (Adjustable) When V FB<0.5V - 15 - KHz (Fixed)When < V OUT*40% -
15
-
KHz
Max. Duty Cycle (ON)
DC V FB=0V force driver on - 100 -
%
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Min. Duty Cycle (OFF) V FB=1.5V for Adjustable
磐石的意思
version force driver off - 0 -
Current limit I CL Pear current, No outside circuit
写作思路
V FB=0V force driver on 2.2 - - A Load Regulation( V
△OUT/V OUT ) V
△OUT I OUT = 0.2 to 2A - 0.6 1.2 %甜蜜在恋
Saturation voltage V SA T I OUT=2A, No outside circuit
V FB=0V force driver on - 1.2 1.4 V
SW pin leakage current SW Pin=0V
I SW L
No outside circuit
V FB=1.5V for Adjustable
文竹叶子发黄怎么办version force driver off
- - -200 uA SW pin=-0.8V V CC=40V force driver off - -5 - mA
EN pin logic input threshold voltage V IL Low (regulator ON) -
1.3
节约用水看图写话
0.6
V V IH High (regulator OFF) 2.0 -
EN pin logic input current I H V EN=2.5V (OFF) - -0.1 -10 uA EN pin input current I L V EN=0.5V (ON) - -0.01 -1 uA Thermal shutdown Temp T SD- 150 - °C
