AC1501-xx(3A开关稳压器)

General Description
The AP1501 series are monolithic IC that design for a step-down DC/DC converter, and own the ability of driving a 3A load without additional transistor component. Due to reducing the number of external component, the board space can be saved easily. The external shutdown function can be controlled by logic level and then come into standby mode. The internal compensation makes feedback control have 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. The AP1501 series operates at a switching frequency of 150KHz thus allowing smaller sized filter components than what would be needed with lower frequency switching regulators. Other features include a guaranteed +4% tolerance on output voltage under specified input voltage and output load conditions, and +15% on the oscillator frequency. The output version included fixed 3.3V, 5V, 12V, and an adjustable type. The packages are available in a standard 5-lead TO-220 package and a 5-lead TO-263.
Typ. 1.23 73 3.3 73
Limit 1.193/1.18 1.267/1.28
Unit V VMIN VMAX %
AP1501-ADJ
η
VOUT η
AP1501-3.3V
Symbol IFB FOSC VSAT DC ICL IL IQ ISTBY VIL VIH IH IL θJC θJA
Parameter Feedback Bias Current Oscillator Frequency Saturation Voltage Max. Duty Cycle(ON) Min. Duty cycle(OFF) Current Limit Output Leakage Output = -1 Current Quiescent Current Standby Quiescent Current Output = 0 ON/OFF pin Logic Input Threshold Voltage ON/OFF Pin Logic Input Current ON/OFF Pin Input Current Thermal Resistance Thermal Resistance with Copper area of Approximately 3 in2
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Rev.1.2 Aug. 23, 2005 1/12
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AP1501
150Khz, 3A PWM Buck DC/DC Converter Ordering Information
AP1501 XX X X X Output version Blank : Adjustable -33 : 3.3V -50 : 5.0V -12 : 12V Package Lead Free Packing Blank : Tube A : Taping
Blank : Normal T5: TO220-5L T5R: TO220-5L(R) L : Lead Free Package K5: TO263-5L
Block Diagram
SD
VIN
200mV Current Source bias 1.235V Reference 2.5V Regulator Start up 220mV
AP1501
150Khz, 3A PWM Buck DC/DC Converter Features
- Output voltage: 3.3V, 5V, 12V and adjustable output version - Adjustable version output voltage range, 1.23V to 37V+4% - 150Khz +15% fixed switching frequency - Voltage mode non-synchronous PWM control - Thermal-shutdown and current-limit protection - ON/OFF shutdown control input - Operating voltage can be up to 40V - Output load current: 3A - TO220-5L TO220-5L(R) and TO263-5L packages - Low power standby mode - Built-in switching transistor on chip
150 1.3 100 0
Max. 60 100 173 173 1.4 1.5
Unit nA Khz V %
5.5 3.6 4.0 6.5 200 2 5 150 2.0 1.3 15 0.02 2.5 3.5 28 23 25 uA 5
o
A uA mA mA uA V
60 10 250 300 0.6
+ Comp _
Comp +
FB
Comp +
Anachip Corp. www.anachip.com.tw 2/12
_
+ Amp _
Frequecy compensation
Pre-driver
150kHz OSC.
Thermal Shutdown
_
3A Switch
Output Gnd
Rev.1.2 Aug. 23, 2005
AP1501
150Khz, 3A PWM Buck DC/DC Converter Absolute Maximum Ratings
Symbol VCC VSD VFB VOUT PD TST TOP VOP Parameter Supply Voltage ON/OFF Pin input Voltage Feedback Pin Voltage Output Voltage to Ground Power Dissipation Storage Temperature Operating Temperature Operating Voltage Rating +45 -0.3 to +40 -0.3 to +40 -1 Internally limited -65 to +150 -40 to +125 +4.5 to +40 Unit V V V V W
Conditions VFB=1.3V (Adjustable version only)
Fra Baidu bibliotek
Min.
Typ. 40
127 110 IOUT=3A no outside circuit VFB=0V force driver on VFB=0V force driver on VFB=12V force driver off peak current no outside circuit VFB=0V force driver on no outside circuit VFB=12V force driver off VIN=40V VFB=12V force driver off ON/OFF pin=5V VIN=40V Low (regulator ON) High (regulator OFF) VLOGIC=2.5V (OFF) VLOGIC=0.5V (ON) TO220-5L TO263-5L TO220-5L TO263-5L Junction to Case Junction to Ambient
Applications
- Simple High-efficiency step-down regulator - On-card switching regulators - Positive to negative converter
Pin Assignments
( Top View )
VFB
Parameter Output Feedback Efficiency Output Voltage Efficiency
Conditions 4.5V < VIN < 40V 0.2A < ILOAD < 3A VOUT programmed for 3V VIN = 12V, ILOAD=3A 4.75V < VIN < 40V 0.2A < ILOAD < 3A VIN = 12V, ILOAD=3A
C/W C/W
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Rev.1.2 Aug. 23, 2005
AP1501
150Khz, 3A PWM Buck DC/DC Converter Electrical Characteristics (Continued)
Symbol
Pin Descriptions
Name
5 SD 4 FB 3 Gnd 2 Output 1 VIN
Description Operating voltage input Switching output Ground Output voltage feedback control ON/OFF shutdown
o o
C C
V
Electrical Characteristics (All Output Voltage Versions)
Unless otherwise specified, VIN=12V for 3.3V, 5V, adjustable version and VIN=24V for the 12V version. ILOAD = 0.5A
VIN Output Gnd FB SD
w
w
w
Metal Tab GND
.D
TO263-5L
at
( Top View )
aS
he
TO220-5L
et
5 SD 4 FB 3 Gnd 2 Output 1 VIN
This datasheet contains new product information. Anachip Corp. reserves the rights to modify the product specification without notice. No liability is assumed as a result of the use of this product. No rights under any patent accompany the sale of the product.