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PDF AP3581C Data sheet ( Hoja de datos )
| Número de pieza | AP3581C | |
| Descripción | Single Phase Synchronous Buck PWM Controller | |
| Fabricantes | BCD | |
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OBSOLETE
Data Sheet
Single Phase Synchronous Buck PWM Controller
AP3581A/B/C
General Description
The1AP3581A/B/C1is1a1compact1synchronous-rect
ified buck controller specifically designed to operate
from 5V/12V supply and deliver high-quality output
voltage as low as 0.6V (AP3581A) or 0.8V
(AP3581B/C). The AP3581A/B/C operates at fixed
frequency of 300kHz (AP3581A/B) or 200kHz
(AP3581C) and provides an optimal level of
integration to reduce size and cost of the power
supply.
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.
This controller provides single feedback loop,
voltage-mode control with fast transient response.
The error amplifier features a 10MHz gain-bandwidth
product and 6V/µs slew rate which enables high
converter bandwidth for fast transient performance.
Other features include internal soft-start, under
voltage protection, over current protection and
shutdown function. With afore-mentioned functions,
this part provides customers a compact, high
efficiency, well-protected and cost-effective
solutions.
The AP3581A/B/C is available in PSOP-8 package.
Features
• Supply Voltage: 5V/12V
• VIN Input Range: 3.0V to 13.2V
• 0.6V/0.8V to 80% of VIN Output Range
• Internal Reference: 0.6V/0.8V
• Simple Single-loop Control
• Voltage-mode PWM Control
• Duty Cycle: 0% to 80%
• Fast Transient Response
• 10MHz High-bandwidth Error Amplifier with
6V/µs Slew Rate
• Fixed Oscillator Frequency: 300kHz/200kHz
• Lossless, Programmable Over Current Protection
(Uses Lower MOSFET RDS(ON) )
• Start-up into Pre-biased Output
• Built-in Thermal Shutdown
• Built-in Soft-start
• Over Current/Voltage Protection
• Under Voltage Protection
• Integrated Boot Diode
Applications
• Power Supplies for Microprocessors/Peripherals
• PCs, Embedded Controllers, Memory Supplies
• DSP and Core Communications Processor
Supplies
• Subsystem Power Supplies
• PCI, AGP, Graphics Cards, Digital TV
• SSTL-2 and DDR/2/3 SDRAM Bus Termination
Supply
• Cable Modems, Set Top Boxes, and DSL
Modems
• Industrial Power Supplies and General Purpose
Supplies
• 5V/12V Input DC-DC Regulators
• Low-voltage Distributed Power Supplies
Oct. 2011 Rev. 1. 0
PSOP-8
Figure 1. Package Type of AP3581A/B/C
BCD Semiconductor Manufacturing Limited
1
1 page  
Data Sheet
Single Phase Synchronous Buck PWM Controller
AP3581A/B/C
Electrical Characteristics
VCC=12V, TA=25°C, unless otherwise specified.
Parameter
SUPPLY INPUT
Supply Voltage
Supply Current
Symbol
VCC
ICC
Quiescent Supply Current
Power Input Voltage
POWER ON RESET
VCC Rising Threshold
VCC Threshold Hysteresis
OSCILLATOR
ICC_Q
VIN
VPOR
VPOR_HYS
Oscillator Frequency
fOSC
Ramp Amplitude
ERROR AMPLIFIER
Open Loop DC Gain (Note 3)
Gain Bandwidth (Note 3)
Slew Rate (Note 3)
Transconductance
Output Source Current
Output Sink Current
∆VOSC
GDC_OL
GBW
SR
PWM CONTROLLER GATE DRIVERS
Upper Gate Source Current
IUG_SRC
Upper Gate Sink Current
IUG_SNK
Upper Gate Sink Resistance
Lower Gate Source Current
Lower Gate Sink Current
Lower Gate Sink Resistance
PHASE Falling to LGATE Rising
Delay
RUGATE
ILG_SRC
ILG_SNK
RLGATE
Conditions
Min
UGATE and LGATE
Pin Open; VCC=12V,
Switching
VFB=VREF+0.1V,
No Switching
4.5
3.0
VCC Rising
4.0
AP3581A/B
AP3581C
VCC=12V
270
180
55
3
VFB<VREF
VFB>VREF
80
80
VBOOT-VPHASE=12V,
VBOOT-VUGATE=6V
VBOOT-VPHASE=12V,
VBOOT-VUGATE=6V
50mA Sink Current,
VBOOT-VPHASE=12V
VCC-VLGATE=6V
VLGATE=6V
50mA Sink Current,
VCC=12V
VPHASE<1.2V
VLGATE>1.2V
to
Typ Max
13.2
5
4
13.2
4.2 4.4
500
300 330
200 220
1.8
70
10
6
800 1100
120
120
-1
1.5
1.6 3.2
-1
1.5
12
50
Unit
V
mA
mA
V
V
mV
kHz
V
dB
MHz
V/µs
µA/V
µA
µA
A
A
Ω
A
A
Ω
ns
Oct. 2011 Rev. 1. 0
BCD Semiconductor Manufacturing Limited
5
5 Page 
Single Phase Synchronous Buck PWM Controller
Typical Application
Data Sheet
AP3581A/B/C
Figure 20. Typical Application Circuit of AP3581A/B/C
Oct. 2011 Rev. 1. 0
BCD Semiconductor Manufacturing Limited
11
11 Page | ||
| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet AP3581C.PDF ] | |
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