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PDF AP3595 Data sheet ( Hoja de datos )
| Número de pieza | AP3595 | |
| Descripción | DUAL PHASE SYNCHRONOUS RECTIFIED BUCK CONTROLLER | |
| Fabricantes | Diodes | |
| Logotipo |  |
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A Product Line of
Diodes Incorporated
AP3595
DUAL PHASE SYNCHRONOUS RECTIFIED BUCK CONTROLLER
Description
The AP3595 is a compact dual phase synchronous rectified buck
controller specifically designed to deliver high quality output voltage.
This device operates at adjustable operation frequency and is
capable of delivering up to 60A output current.
This controller integrates internal MOSFET drivers that support
12V+12V bootstrapped voltage for high efficiency power conversion.
The bootstrap diode is built-in to simplify the circuit design and
minimize external part count.
The AP3595 features configurable gate driving voltage for maximum
efficiency and optimal performance. The built-in bootstrap diode
simplifies the circuit design and reduces external part count and PCB
space. The output voltage is precisely regulated to the reference input
that is dynamically adjustable by external voltage divider.
Other features include adjustable soft start, adjustable operation
frequency, and quick response to step-load transient. With afore-
mentioned functions, the IC provides customers a compact, high
efficiency, well-protected and cost-effective solution.
Pin Assignments
Pin 1 Mark
(Top View)
24 23 22 21 20 19
REFIN 1
18 VCC
VREF 2
RT/EN 3
IOFS 4
COMP 5
FB 6
EP
17 PVCC
16 LG1
15 PHASE1
14 HG1
13 BOOT1
7 8 9 10 11 12
This IC is available in U-QFN4040-24 package.
U-QFN4040-24 (FN Package)
Features
Operate with Single Supply Voltage
Simple Single Loop Voltage Mode Control
12V+12V Bootstrapped Drivers with Internal Bootstrap Diode
Adjustable Over Current Protection by DCR
Current Sensing
Adjustable Current Balancing by RDS(ON) Current Sensing
Adjustable Operation Frequency from 50kHz to 1MHz Per Phase
External Compensation
Dynamic Output Voltage Adjustment
Adjustable Soft Start
U-QFN4040-24 Package
RoHS Compliant and 100% Lead (Pb)-free
Totally Lead-free & Fully RoHS Compliant (Note1 & 2)
Halogen and Antimony Free. “Green” Device (Note 3)
Applications
Middle-High End GPU Core Power
High End Desktop PC Memory Core Power
Low Output Voltage, High Power Density
DC-DC Converters
Voltage Regulator Modules
Notes:
1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2) compliant.
2. See http://www.diodes.com/quality/lead_free.html for more information about Diodes Incorporated’s definitions of Halogen- and Antimony-free, "Green"
and Lead-free.
3. Halogen- and Antimony-free "Green” products are defined as those which contain <900ppm bromine, <900ppm chlorine (<1500ppm total Br + Cl) and
<1000ppm antimony compounds.
AP3595
Document number: DS36749 Rev. 1 - 2
1 of 23
www.diodes.com
January 2014
© Diodes Incorporated
Free Datasheet http://www.datasheetlist.com/
1 page  
Recommended Operating Conditions
Symbol
VCC
TA
TJ
Parameter
Supply Input Voltage
Operating Ambient Temperature
Operating Junction Temperature
A Product Line of
Diodes Incorporated
AP3595
Min
10.8
-40
-40
Max
13.2
+85
+125
Unit
V
°C
°C
Electrical Characteristics (@VCC=12V, TA=+25C, unless otherwise specified.)
Symbol
Parameter
SUPPLY INPUT
VCC Supply Input Voltage
ICC Supply Current
IQ Quiescent Current
VPCC
Regulated Supply Voltage
VRTH
POR Threshold
VHYS
POR Hysteresis
CHIP ENABLE/FREQUENCY SETTING
IRT/EN
VRT/EN
–
RT/EN Sourcing Current
RT/EN Voltage
Switching Frequency Setting Range
fOSC
△ fOSC
OSCILLATOR
–
–
Free Run Switching Frequency
Switching Frequency Accuracy
Maximum Duty Cycle
Minimum Duty Cycle
VOSC
Ramp Amplitude
POWER SAVING MODE
VPSI_H
VPSI_L
Threshold Voltage for Entering Dual
Phase
Threshold Voltage for Entering
Single Phase
REFERENCE VOLTAGE
VREF
△ VREF
Reference Voltage Accuracy
Reference Voltage Load Regulation
△ VFB
Output Voltage Accuracy
ERROR AMPLIFIER
AO
GBW
SR
Open Loop DC Gain
Gain Bandwidth Product
Slew Rate
ICOMP
Maximum Current (Sink and Source)
Conditions
–
HG and LG Open, VCC=12V,
Switching
No Switching, IPCC=0mA
RT/EN=0V, IPCC=0mA
–
–
VRT/EN=GND
RRT=33kΩ
–
RRT=33kΩ
fOSC=200kHz to 500kHz
VCC=12V
–
–
VPSI rising
VPSI falling
IREF=100A
IREF=0 to 2mA
|VREFIN-VFB|, VCC=12V, No Load,
RDRP=0, VREFIN=0.8V to 1.6V
Guaranteed by design
CLOAD=5pF, Guaranteed by design
Guaranteed by design
VCOMP=1.6V
Min
10.8
–
–
8
8
–
100
–
50
270
-15
–
–
–
1.2
–
1.98
-5
–
70
–
15
1.5
Typ
Max
Unit
– 13.2 V
5 – mA
4 – mA
9 10 V
9 10 V
1 –V
150 200 A
1 –V
–
1000
kHz
300 330 kHz
– 15 %
40 – %
0 –%
3.5 – V
– –V
– 0.4 V
2.0 2.02 V
– 5 mV
– 5 mV
80 – dB
20 – MHz
20 – V/s
2.0 – mA
AP3595
Document number: DS36749 Rev. 1 - 2
5 of 23
www.diodes.com
January 2014
© Diodes Incorporated
Free Datasheet http://www.datasheetlist.com/
5 Page 
Application Information (Cont.)
A Product Line of
Diodes Incorporated
AP3595
As mentioned in the above section, the slew rate of voltage transition at SS pin and VOUT during soft start and VREFIN jumping is controlled by the
capacitor connected to the SS pin. This reduces inrush current to charge/discharge the large output capacitors during soft start and VID changing,
and prevents OCP, OVP/UVP false trigger. The SS buffer sinking/sourcing capability is limited to 22A during soft start and 200A after soft start
end. Therefore, the slew rate of voltage ramping up/down at SS, EAP and FB pin during soft start or VID changing is calculated as:
During Soft Start
dVSS dVEAP dVFB 22A
dt dt dt CSS
After Soft Start
dVSS dVEAP dVFB 200 A
dt dt dt CSS
4. Pre-Bias Function
AP3595 features pre-bias start-up capability. If the output voltage is pre-biased with a voltage VBIAS, that accordingly makes VFB higher than
reference voltage ramping VEAP. The error amplifier keeps VCOMP lower than the valley of the saw tooth waveform and makes PWM comparators
output low until the ramping VEAP catches up the feedback voltage. The IC keeps both upper and lower MOSFETs off until the first pulse takes
place.
5. Chip Oscillator Frequency Programming
A resistor RFS connected to RT/EN pin programs the oscillator frequency as:
fOSC
10000
(k Hz)
RFS (k)
Figure 2 shows the relationship between oscillation frequency and RFS.
RFS (k)
Figure 2. Switching Frequency vs. RFS
When released, the RT/EN pin voltage is regulated at 1V. Pulling the RT/EN pin to ground shuts down the IC.
6. Current Balance
AP3595 extracts phase currents for current balance by parasitic on-resistance of the lower switches when turned on as shown in Figure 3.
PHASE
_
+
+_ Reference
Voltage
ICS1
Sample
Current
&Hold
Balance
ICS2
Figure 3. RDS(ON) Current Sensing Scheme
The GM amplifier senses the voltage drop across the lower switch and converts it into current signal when it turns on. The sampled and held
current is expressed as:
ICSX ILX R DS(ON) 10 3 12A
AP3595
Document number: DS36749 Rev. 1 - 2
11 of 23
www.diodes.com
January 2014
© Diodes Incorporated
Free Datasheet http://www.datasheetlist.com/
11 Page | ||
| Páginas | Total 23 Páginas | |
| PDF Descargar | [ Datasheet AP3595.PDF ] | |
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