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PDF IR3477 Data sheet ( Hoja de datos )
| Número de pieza | IR3477 | |
| Descripción | 15A Highly Integrated SupIRBuck | |
| Fabricantes | International Rectifier | |
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Hay una vista previa y un enlace de descarga de IR3477 (archivo pdf) en la parte inferior de esta página. Total 21 Páginas | ||
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15A Highly Integrated SupIRBuckTM IR3477
FEATURES
• Input Voltage Range: 3V to 27V
• Output Voltage Range: 0.5V to 12V
• Continuous 15A Load Capability
• Constant On‐Time Control
• Compensation Loop not Required
• Excellent Efficiency at Very Low Output Currents
• Programmable Switching Frequency and Soft Start
• Thermally Compensated Over Current Protection
• Power Good Output
• Precision Voltage Reference (0.5V, +/‐1%)
• Enable Input with Voltage Monitoring Capability
• Pre‐bias Start Up
• Thermal Shut Down
• Under/Over Voltage Fault Protection
• Forced Continuous Conduction Mode Option
• Small, Low Profile 5mm x 6mm QFN Package
DESCRIPTION
The IR3477 SupIRBuckTM is an easy‐to‐use, fully integrated
and highly efficient DC/DC voltage regulator. The onboard
constant on time hysteretic controller and MOSFETs make
IR3477 a space‐efficient solution that delivers up to 15A of
precisely controlled output voltage.
Programmable switching frequency, soft start, and
thermally compensated over current protection allows for
a very flexible solution suitable for many different
applications and an ideal choice for battery powered
applications.
Additional features include pre‐bias startup, very precise
0.5V reference, under/over voltage shutdown, thermal
protection, power good output, and enable input with
voltage monitoring capability.
APPLICATIONS
• Notebook and Desktop Computers
• Consumer Electronics – STB, LCD, TV, Printers
• 12V and 24V Distributed Power Systems
• General Purpose POL DC‐DC Converters
• Game Consoles and Graphics Cards
BASIC APPLICATION
Figure 1: IR3477 Basic Application Circuit
EFFICIENCY
95%
85%
75%
65%
55%
19VIN
12VIN
8VIN
45%
0.01 0.1 1 10
Load Current (A)
Figure 2: IR3477 Efficiency
100
1 March 27, 2013 | V2.5 | PD97604
Free Datasheet http://www.datasheet4u.com/
1 page  
15A Highly Integrated SupIRBuckTM IR3477
PIN DESCRIPTIONS
PIN #
1
2
3
4, 17
5
6
7
8
9
10
11
12
13
14
15
16
PIN NAME
FCCM
ISET
PGOOD
GND
FB
SS
NC
3VCBP
NC
VCC
PGND
PHASE
VIN
BOOT
FF
EN
I/O LEVEL
PIN DESCRIPTION
3.3V
5V
Reference
3.3V
3.3V
‐
3.3V
‐
5V
Reference
VIN
VIN
VIN + VCC
VIN
5V
Forced Continuous Conduction Mode (CCM). Ground this pin to enable diode
emulation mode or discontinuous conduction mode (DCM). Pull this pin to 3.3V
to operate in CCM under all load conditions.
Connecting resistor to PHASE pin sets over current trip point.
Power good open drain output – pull up with a resistor to 3.3V
Bias return and signal reference.
Inverting input to PWM comparator, OVP / PGOOD sense.
Soft start/shutdown. This pin provides user programmable soft‐start function.
Connect an external capacitor from this pin to GND to set the startup time of the
output voltage. The converter can be shutdown by pulling this pin below 0.3V.
‐
For internal LDO. Bypass with a 1.0µF capacitor to GND.
‐
VCC input. Gate drive supply. A minimum of 1.0µF ceramic capacitor is required.
Power return.
Phase node (or switching node) of MOSFET half bridge.
Input voltage for the system.
Bootstrapped gate drive supply – connect a capacitor to PHASE.
Input voltage feed forward – sets on‐time with a resistor to VIN.
Enable pin to turn on and off the device. Use two external resistors to set the
turn on threshold (see Electrical Specifications) for input voltage monitoring.
5 March 27, 2013 | V2.5 | PD97604
Free Datasheet http://www.datasheet4u.com/
5 Page 
15A Highly Integrated SupIRBuckTM IR3477
TYPICAL OPERATING DATA
Tested with demoboard shown in Figure 4, VIN = 12V, VCC = 5V, VOUT = 1.05V, Fs = 300kHz, TA = 25oC, no airflow, unless
otherwise specified.
VOUT
PHASE
iL
VOUT
PHASE
iL
50mV/div 10V/div 5A/div
20µs/div
Figure 17: Load Transient 0‐8A
FCCM
PHASE
VOUT
iL
50mV/div 10V/div 5A/div
20µs/div
Figure 18: Load Transient 4‐12A
FCCM
PHASE
VOUT
iL
5V/div 10V/div 500mV/div 5A/div
10µs/div
Figure 19: DCM/FCCM Transition
2V/div 10V/div 500mV/div 5A/div
5µs/div
Figure 20: FCCM/DCM Transition
Figure 21: Thermal Image at VIN = 12V, IOUT = 15A
(IR3477: 98oC, Inductor: 69oC, PCB: 49oC)
11 March 27, 2013 | V2.5 | PD97604
Figure 22: Thermal Image at VIN = 19V, IOUT = 15A
(IR3477: 111oC, Inductor: 75oC, PCB: 55oC)
Free Datasheet http://www.datasheet4u.com/
11 Page | ||
| Páginas | Total 21 Páginas | |
| PDF Descargar | [ Datasheet IR3477.PDF ] | |
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