喝白醋
林军厨房The Ad4560 ries operates at a switching Operating voltage can be up to 42V The Ad4560 ries are monolithic IC designed for a 150KHz, 2A PWM Buck DC/DC Converter
Features
- Output voltage: 3.3V, 5V, 12V and adjustable output version
- Adjustable version output voltage range, 1.23V to 18V+4%
- 150KHz +15% fixed switching frequency
- Voltage mode non-synchronous PWM control - Thermal-shutdown and current-limit protection - ON/OFF shutdown control input - - Output load current: 2A - SOP-8L packages
- Low power standby mode
- Built-in switching transistor on chip
Applications
- Simple High-efficiency step-down regulator - On-card switching regulators - Positive to negative conv
erter
General Description
step-down DC/DC converter, and own the ability of driving a 2A 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. If current limit function occurred and V FB is down to 0.5V below, the switching frequency will be reduced. 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 8-lead SOP-8 package.
Pin Assignments
玫瑰粉色
Output FB SD
GND GND GND GND
V IN
Pin Descriptions
Name Description
V IN
Operating voltage input
Output Switching output GND Ground
FB Output voltage feedback control SD ON/OFF Shutdown
150KHz, 2A PWM Buck DC/DC Converter
Ordering Information S: SOP-8L
Blank : Tube A : Taping
Blank : Adjustable
-33 : 3.3V -50 : 5.0V -12 : 12V
Blank : Normal L : Lead Free Package
Block Diagram
Gnd
Output V IN
SD
FB
150KHz, 2A PWM Buck DC/DC Converter
Absolute Maximum Ratings Symbol
Parameter
Rating Unit V CC Supply Voltage
+24 V V SD ON/OFF Pin input voltage -0.3 to +18 V V FB Feedback Pin voltage -0.3 to +18
V V OUT Output voltage to Ground -1
V P D Power dissipation Internally limited W
T ST Storage temperature -65 to +150 o C T OP Operating temperature -40 to +125 o
C
V OP
Operating voltage
+4.5 to +22
V
Electrical Characteristics (All Output Voltage Versions) Unless otherwi specified, V IN =12V for 3.3V, 5V, adjustable version and V IN =18V for the 12V version. I LOAD = 0.5A
Symbol Parameter
Conditions
Min.
Typ.
Max. Unit
-50
I B
Feedback bias current
V FB =1.3V
(Adjustable version only) -10 -100
nA
127 150 173
F OSC Oscillator frequency
110 173
KHz
F SCP
Oscillator frequency of short circuit protect When current limit occurred and V FB < 0.5V, Ta=25 o C
5 15 25 KHz 1.4 V SAT Saturation voltage I OUT =2A
No outside circuit
V FB =0V force driver on
1.25
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1.5 V Max. Duty Cycle (ON) V FB =0V force driver on
100 DC
Min. Duty Cycle (OFF) V FB =12V force driver off
%
I CL Current limit Peak current
No outside circuit
V FB =0V force driver on
3 A Output = 0
No outside circuit
V FB =12V force driver off
-200 uA I L Output = -1 Output leakage current V IN =22V
-5 mA I Q Quiescent Current V FB =12V force driver off
5 10 mA
150
I STBY
Standby Quiescent Current ON/OFF pin=5V
V IN =22V
70 200
uA
V IL Low (regulator ON)
- 0.6
V IH ON/OFF pin logic input threshold voltage High (regulator OFF) 2.0 1.3 - V
I H ON/OFF pin logic input
current
V LOGIC =2.5V (OFF)
-0.01 I L ON/OFF pin input current V LOGIC =0.5V (ON)
-0.1
-1
民事诉讼委托书uA
苹果成熟时
ΘJC Thermal Resistance SOP-8L
Junction to
ca
15
o
C/W ΘJA
Thermal Resistance
With copper area of
approximately 3 in 2
SOP-8L Junction to
ambient
70 o
深情网名
C/W
150KHz, 2A PWM Buck DC/DC Converter
Electrical Characteristics (Continued)
Specifications with boldface type are for full operating temperature range, the other type are for T J=25ºC. Typical Application Circuit
AD4560 Supply Current AD4560 Switch Current Limit v.s. Temperature
AD4560 Saturation Voltage v.s. Temperature
AD4560 Efficiency v.s. Temperature
AD4560 Efficiency v.s. Temperature
150KHz, 2A PWM Buck DC/DC Converter
Typical Performance Characteristics
(Vin=12V,Vout=5V,Io=2A)
(Vin=12V,Vout=3.3V,Io=2A)
(Vcc=12V,Vfb=0V,VSD=0)
(Vcc=12V,Vfb=0V)
v.s. Temperature
(Vcc=12V , No Load ,Von/off =0V(Switch ON) ,Von/off =5V(Switch OFF))
AD4560 Output Voltage v.s. Temperature
AD4560 Feedback Curr AD4560 Frequency v.s. Temperature AD4560 ON/OFF Current v.s. ON/OFF Voltage
AD4560 Threshold Voltage v.s. Temperature
150KHz, 2A PWM Buck DC/DC Converter
Typical Performance Characteristics (Continued)
(Vcc=12V , Io=100mA)
刘邦项羽(Vin=12V)
(Vcc=12V , Io=500mA ,Vout=5V)
ent v.s. Temperature
(Vcc=12V , Vout=5V,Vfb=1.3V)
(Vin=12V ,Io=2A)
