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AP1530
18V 3A 300KHz BUCK CONVERTER
Features
* * * * * * * * * * Input voltage: 3.6V to 18V. Output voltage: 0.8V to VCC. Duty ratio: 0% to 100% PWM control Oscillation frequency: 300kHz typ. Current Limit, Enable function Thermal Shutdown function Built-in internal SW P-channel MOS Lead Free package: SOP-8L SOP-8L: Available in "Green" Molding Compound (No Br, Sb) (Note 1) Lead Free Finish/ RoHS Compliant (Note 2)
General Description
AP1530 consists of step-down switching regulator with PWM control. These devices include a reference voltage source, oscillation circuit, error amplifier and internal PMOS. AP1530 provides low-ripple power, high efficiency, and excellent transient characteristics. The PWM control circuit is able to vary the duty ratio linearly from 0 up to 100%. This converter also contains an error amplifier circuit. An enable function, an over current protection and a short circuit protection are built inside, and when OCP or SCP happens, the operation frequency will be reduced from 300kHz to 50kHz. Also, an internal compensation block is built in to minimum external component count. With the addition of an internal P-channel Power MOS, a coil, capacitors, and a diode connected externally, these ICs can function as step-down switching regulators. They serve as ideal power supply units for portable devices when coupled with the SOP-8L package, providing such outstanding features as low current consumption. Since this converter can accommodate an input voltage up to 18V, it is also suitable for the operation via an AC adapter.
Applications
* * * * * * * * * PCD Motherboard LCD Monitor Graphic Card DVD-Video Player Telecom Equipment ADSL Modem Printer and other Peripheral Equipment Microprocessor core supply Networking power supply
Typical Application Circuit
VOUT = 5V/3A RA 6.8K
VIN ROCSET COCSET Option 3K C IN 470uF CVcc 0.1uF R EN 100K C EN 0.1uF
Vcc
Output
L1 22uH Cc Option
AP 1530
OCSET EN FB V SS
+ -
C
+ -
COUT 470uF
0.1uF
D1*
RB 1.3K
VOUT = V FB x (1+ R A /RB ) R B = 0.7K~5K ohm
* Suggested DIODES Power Schottky P/N: B340 series or PDS340.
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AP1530
18V 3A 300KHz BUCK CONVERTER
Ordering Information
AP 1 5 3 0 S X - 13
Package S : SOP-8L
Lead Free L : Lead Free G : Green
Packing
13 : Tape & Reel
Device AP1530SL-13 AP1530SG-13
Notes:
Package Code S S
Packaging (Note 2) SOP-8L SOP-8L
13" Tape and Reel Quantity Part Number Suffix 2500/Tape & Reel -13 2500/Tape & Reel -13
1. EU Directive 2002/95/EC (RoHS). All applicable RoHS exemptions applied. Please visit our website at http://www.diodes.com/products/lead_free.html. 2. Pad layout as shown on Diodes Inc. suggested pad layout document AP02001, which can be found on our website at http://www.diodes.com/datasheets/ap02001.pdf.
Pin Assignments
(1) SOP-8L
( Top View ) Vss Vss Output Output
FB 1 EN 2 OCSET 3 VCC 4
8 7 6 5
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AP1530
18V 3A 300KHz BUCK CONVERTER
Pin Descriptions
Pin Name FB Pin No. 1 Description Feedback pin Power-off pin H: Normal operation (Step-down operation) L: Step-down operation stopped (All circuits deactivated) Add an external resistor to set max output current IC power supply pin Switch Pin. Connect external inductor/diode here. Minimize trace area at this pin to reduce EMI GND Pin
EN
2
OCSET VCC Output VSS
3 4 5, 6 7, 8
Block Diagram
Output Oscillation Circuit Vcc PWM-Switched Control Circuit Thermal Shutdown VEN 100uA Vss
+
Reference Voltage Source
FB
-
EN
OCSET
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AP1530
18V 3A 300KHz BUCK CONVERTER
Absolute Maximum Ratings
Symbol ESD HBM ESD MM VCC VFB VEN VOUTPUT PD TJ TST Parameter Human Body Model ESD Protection Machine Model ESD Protection VCC Pin Voltage Feedback Pin Voltage EN Pin Voltage Switch Pin Voltage Power Dissipation Operating Junction Temperature Range Storage Temperature Range Rating 5 500 VSS - 0.3 to VSS + 20 VSS - 0.3 to VCC VSS - 0.3 to VIN + 0.3 VSS - 0.3 to VIN + 0.3 Internally limited -40 to +125 -65 to +150 Unit KV V V V V V mW o C o C
Caution: The absolute maximum ratings are rated values exceeding which the product could suffer physical damage. These values must therefore not be exceeded under any conditions.
Recommended Operating Conditions
Symbol VIN IOUT TA Parameter Input Voltage Output Current Operating Ambient Temperature Min 3.6 0 -20 Max 18 3 85 Unit V A o C
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AP1530
18V 3A 300KHz BUCK CONVERTER
Electrical Characteristics
(VIN = 12V, TA=25C, unless otherwise specified) Symbol Parameter Conditions Min VFB Feedback Voltage IOUT=0.1A 0.784 IFB Feedback Bias Current IOUT=0.1A ISW Switch Current -3.5 Current Consumption During ISHDN VEN =0V Power Off VOUT Line Regulation VIN=5V~18V /VIN VOUT Load Regulation IOUT=0.1 to 3A /VOUT fOSC Oscillation Frequency Measure waveform at SW pin 240 Frequency of Current Limit or fOSC1 Measure waveform at SW pin Short Circuit Protection VIH Evaluate oscillation at SW pin 2.0 EN Pin Input Voltage VIL Evaluate oscillation stop at SW pin IENH -EN Pin Input Leakage Current IENL -IOCSET OCSET Pin Bias Current -75 TSS Soft-Start Time -0.3 TSHDN Thermal shutdown threshold THYS Thermal shutdown hysteresis VIN=5V, VFB=0V RDSON Internal MOSFET RDS(ON) VIN=12V, VFB=0V VIN=12V, VOUT = 5V EFFI Efficiency IOUT=3A Thermal Resistance JA SOP-8L (Note 3) Junction-to-Ambient Thermal Resistance JC SOP-8L (Note 3) Junction-to-Case
Notes:
Typ. 0.8 0.1 10 1 0.2 300 50 20 -10 90 2 150 55 110 70 92 134 22
Max 0.816 0.5 2 0.5 360 0.8 105 5 150 100 -
Unit V A A A % % kHz kHz V A A A ms C C m %
o
C/W C/W
o
3. Test condition SOP-8L: Device mounted on FR-4 substrate 2oz copper, minimum recommended pad layout, and single side. For better thermal performance, please arrange larger copper pad of layout for heatsink.
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18V 3A 300KHz BUCK CONVERTER
Typical Performance Characteristics
VIN vs. Frequency
340 338 336 334 332 330 328 326 324 322 320 2 4 6 (VOUT=3.3V; IOUT=0.2A) 0.820 0.815 0.810 0.805 0.800 0.795 0.790 0.785 0.780 2 4 6
VIN vs. VFB
(VOUT=3.3V; IOUT=0.1A)
FOSC (kHz)
VFB (V)
8
10
12 14 VIN (V)
16
18
20
22
8
10
12 14 VIN (V)
16
18
20
22
Line Regulation
3.40 3.35 3.30 3.25 3.20 3.15 3.10 3.05 3.00 2 4 (VOUT=3.3V; IOUT=0.2A) 5.00 4.99 4.98 4.97 4.96 4.95 4.94 4.93 4.92 0 0.5
Load Regulation
(VIN=12V; VOUT=5V)
VOUT (V)
VOUT (A)
6
8
10
12 14 VIN (V)
16
18
20
22
1
1.5 IOUT (A)
2
2.5
3
Efficiency
100% 90% 80% 70% 60% 50% 40% 30% 20% 10% 0% 0 0.5 VIN=5V; VOUT=3.3V
Efficiency (%)
1
1.5 IOUT (A)
2
2.5
3
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AP1530
18V 3A 300KHz BUCK CONVERTER
Typical Performance Characteristics
AP1530 Vout Ripple (Vin= 12V; Vout= 3.3V; Iout= 0.1A)
(Continued)
AP1530 Vout Ripple (Vin= 12V; Vout= 3.3V; Iout= 3A)
Test Circuit
open VCC OUTPUT FB open
Oscillation
A
VCC
OUTPUT
FB
OCSET
A
+
EN
VSS
-
OCSET EN
VSS
Enable function test
Feedback function test
VCC
+ -
OUTPUT
FB
OCSET EN VSS
+ V
Operation function test
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AP1530
18V 3A 300KHz BUCK CONVERTER
Functional Description
PWM Control The AP1530 is a DC/DC converter that employs pulse width modulation (PWM) scheme. Its pulse width varies in the range of 0% to 99%, based on the output current loading. The output ripple voltage caused by the PWM high frequency switching can easily be reduced through an output filter. Therefore, this converter provides a low ripple output supply over a broad range of input voltage & output current loading Under Voltage Lockout The under voltage lockout circuit of the AP1530 assures that the high-side MOSFET driver remains in the off state whenever the supply voltage drops below 3.3V. Normal operation resumes once VCC rises above 3.5V. Current Limit Protection The current limit threshold is set by external resistor ROCSET connected from VCC supply to OCSET pin. The internal sink current IOCSET (90uA typical) across this resistor sets the voltage at OCSET pin. When the PWM voltage is less than the voltage at OCSET, an over-current condition is triggered. The current limit threshold is given by the following equation: Inductor Selection For most designs, the operates with inductors of 22H to 33H. The inductor value can be derived from the following equation:
L=
VIN - VOUT VOUT x fs x I VIN
Where IL is inductor Ripple Current. Large value inductors lower ripple current and small value inductors result in high ripple current. Choose inductor ripple current approximately 15% of the maximum load current 3A, IL=0.45A. The DC current rating of the inductor should be at least equal to the maximum load current plus half the ripple current to prevent core saturation (3A+0.225A). Input Capacitor Selection This capacitor should be located close to the IC using short leads and the voltage rating should be approximately 1.5 times the maximum input voltage. The RMS current rating requirement for the input capacitor of a buck regulator is approximately 12 the DC load current. A low ESR input capacitor sized for maximum RMS current must be used. A 470F low ESR capacitor for most applications is sufficient. Output Capacitor Selection The output capacitor is required to filter the output voltage and provides regulator loop stability. The important capacitor parameters are the 100KHz Equivalent Series Resistance (ESR), the RMS ripples current rating, voltage rating and capacitance value. For the output capacitor, the ESR value is the most important parameter. The output ripple can be calculated from the following formula.
IPEAK x RDS(ON) = IOCSET x R OCSET
( I) IPEAK > IOUT (MAX) + 2
where,
I =
VIN - VOUT FSxL
x
VOUT VIN
IPEAK is the output peak current; RDS (ON) is the MOSFET ON resistance; FS is the PWM frequency (300KHz typical). Also, the inductor value will affect the ripple current I. The above equation is recommended for input voltage range of 5V to 18V. For input voltage lower than 5V or ambient temperature over 100C, higher ROCSET is recommended. The recommended minimum ROCSET value is summarized below: VIN (V) 4 5 12 18 VOUT (V) 0.8 3.3 5 12 ROCSET () 3.9K 3.0K 3.0K 3.0K
V RIPPLE = IL x ESR
The bulk capacitor's ESR will determine the output ripple voltage and the initial voltage drop after a high slew-rate transient. An aluminum electrolytic capacitor's ESR value is related to the capacitance and its voltage rating. In most case, higher voltage electrolytic capacitors have lower ESR values. Most of the time, capacitors with much higher voltage ratings may be needed to provide the low ESR values required for low output ripple voltage. PCB Layout Guide If you need low TC & TJ or large PD (Power Dissipation), The dual SW pins(5& 6) and Vss pins(7& 8)on the SOP-8L package are internally connected to die pad, The evaluation board should be allowed for maximum copper area at output (SW) pins. 1. Connect FB circuits (R1, R2, C1) as closely as possible and keep away from inductor flux for pure VFB. 2. Connect C3 to Vcc and Vss pin as closely as possible to get good power filter effect. 3. Connect R4 to Vcc and OCSET pin as closely as possible. 4. Connect ground side of the C2 & D1 & C4 as closely as possible and use ground plane for best performance.
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18V 3A 300KHz BUCK CONVERTER
Functional Description
(Continued)
Keep the gap of exposed pads from short circuit. Top Side Layout Guide
Recommended exposed-pads gap: 30~40mil (0.75~1mm)
Use vias to conduct the heat into the backside of PCB layer. The heat sink at output (SW) pins should be allowed for maximum solder-painted area. Bottom Side Layout Guide
Brown: IC exposed pads. Red: recommended layout. Reference pads layout dimension: Output: 90 x 50 mil Vss: 90 x 60 mil
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AP1530
18V 3A 300KHz BUCK CONVERTER
Functional Description
VIN R4 C2 R5 C6 C7 Option
(Continued)
Vcc
Output
L1
VOUT R1
AP1530
OCSET EN V SS FB
C1 Option
+ -
C8
+ -
C4
C3
D1
R2
Figure: Layout numbering comparison
Marking Information
(1) SOP-8L
( Top View )
8 5
Logo Part Number AP1530 YY WW X X
1 4
L : Lead Free G : Green YY : Year : 08, 09,10~ WW : Week : 01~52; 52 represents 52 and 53 week X : Internal Code
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AP1530
18V 3A 300KHz BUCK CONVERTER
Package Information
(1) Package Type: SOP-8L
( All Dimensions in mm )
3.85/3.95
5.90/6.10
0.10/0.20
0.254 0.62/0.82
Gauge Plane Seating Plane
Detail "A"
7~9 1.30/1.50 1.75max. 0.15/0.25
0.35max. 45
7~9
Detail "A"
0/8
1.27typ 4.85/4.95
0.3/0.5
8x-0.60 5.4 6x-1.27 8x-1.55
Land Pattern Recommendation (Unit: mm)
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18V 3A 300KHz BUCK CONVERTER
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Customers represent that they have all necessary expertise in the safety and regulatory ramifications of their life support devices or systems, and acknowledge and agree that they are solely responsible for all legal, regulatory and safety-related requirements concerning their products and any use of Diodes Incorporated products in such safety-critical, life support devices or systems, notwithstanding any devices- or systems-related information or support that may be provided by Diodes Incorporated. Further, Customers must fully indemnify Diodes Incorporated and its representatives against any damages arising out of the use of Diodes Incorporated products in such safety-critical, life support devices or systems. Copyright (c) 2009, Diodes Incorporated www.diodes.com
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