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PDF NX2155H Data sheet ( Hoja de datos )
| Número de pieza | NX2155H | |
| Descripción | Single Power Supply Synchronous PWM Controller | |
| Fabricantes | Microsemi | |
| Logotipo |  |
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NX2155H
Single Power Supply Synchronous PWM Controller
Description
The NX2155H controller IC is a single input
supply synchronous Buck controller IC
designed for step down DC to DC converter
applications. The NX2155H is optimized to
convert bus voltages from 8V to 22V to output
as low as 0.8V voltage.
An internal regulator converts the bus voltage
to 5V, which provides voltage supply to internal
logic and driver circuits. The NX2155H
operates at a programmable frequency of
2MHz, and employs loss-less current limiting by
sensing the Rdson of synchronous MOSFET
followed by hiccup feature. Feedback
undervoltage triggers the Hiccup mode.
Other features of the device are: Internal
Schottky diode, thermal shutdown, 5V gate
drive, adaptive deadband control, internal
digital soft start, 5VREG undervoltage lock out
and Shutdown capability via the comp pin.
Features
Single Supply Voltage from 8V to 22V
Internal 5V Regulator
Programmable Operational Frequency of
2MHz
Internal Digital Soft Start Function
Less than 50nS Adaptive Deadband
Current Limit Triggers Hiccup by Sensing
RDSON of Synchronous MOSFET
Pb-
Applications
LCD TV
Graphic Card on Board Converters
Memory Vddq Supply in Mother board
Applications
On board DC to DC such as 12V to 3.3V,
2.5V, or 1.8V
Hard Disk Drive
Set Top Box
Typical Application Diagram
5
5VREG
6
VIN
BST
3
0.1µF
M1
AO6800
4.7µF
HDRV 2
SW 1
NX2155H
OCP 10
7 RT
4.22k
LDRV 4
0.1µF
6.04k
8 COMP
GND (PAD)
FB 9
15k
VIN +12V
10µF
1µH
301
180pf
49.9k
1nF
9.53k
VOUT
+5V@2A
10µF x 2, 10V, X5R
10pF
September 2013 Rev. 1.2
Figure 1 · Typical Application of NX2155H
www.microsemi.com
© 2013 Microsemi Corporation- Analog Mixed Signal Group
1
1 page  
Electrical Characteristics
SYMBOL PARAMETER
CONDITIONS
Soft Start
TSS FS = 2.2 MHz
Oscillator (RT)
FS
VRAMP
Frequency
Ramp- Amplitude Voltage
RT = 4.22k
Max Duty Cycle
FS = 2.2MHz
Min Controllable On Time
Error Amplifiers
Transconductance
IB Input Bias Current
Comp SD Threshold
High Side Driver (CL = 2200pf)
HDRVSRC
Output Impedance, Sourcing I = 200mA
HDRVSNK
Output Impedance, Sinking I = 200mA
TDRVRISE
Rise Time
TDRVFALL
Fall Time
TDRVDBAND Dead band Time
LDRV going low to HDRV
going high, 10%-10%
Low Side Driver (CL = 2200pf)
LDRVSRC
Output Impedance, Sourcing I = 200mA
LDRVSNK
Output Impedance, Sinking I = 200mA
TDRVRISE
Rise Time
TDRVFALL
Fall Time
TDRVDBAND Dead band Time
SW going low to LDRV
going high, 10%-10%
OCP
OCP Current
Over Temperature Shutdown
OTP Threshold
OTP Hysteresis
Internal Schottky Diode
Forward Voltage Drop
Forward current = 20mA
MIN
1.15
62
1350
0 .14
7
30
30
TYP MAX UNITS
580 µS
2250
kHz
1.4 1.65 V
71 80 %
150 ns
1850
10
0.2
2350
0.26
µmho
nA
V
1.9 Ω
1.7 Ω
14 ns
17 ns
20 36 ns
1.9 Ω
1Ω
25 ns
25 ns
38 45 ns
37 45 µA
150 °C
20 °C
350 500 mV
5
5 Page 
Demo Board Design (VBUS = 12V, VOUT = 5V/10A, Frequency = 400kHz
Demo Board Design (VBUS = 12V, VOUT = 5V/10A, Frequency = 400kHz
Figure 14 · Simplified Demo board schematic on NX2155H
11
11 Page | ||
| Páginas | Total 22 Páginas | |
| PDF Descargar | [ Datasheet NX2155H.PDF ] | |
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