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PDF NX2114A Data sheet ( Hoja de datos )
| Número de pieza | NX2114A | |
| Descripción | 300kHz & 600kHz SYNCHRONOUS PWM CONTROLLER | |
| Fabricantes | Microsemi | |
| Logotipo |  |
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NX2114/2114A
300kHz & 600kHz SYNCHRONOUS PWM CONTROLLER
PRELIMINARY DATA SHEET
Pb Free Product
DESCRIPTION
FEATURES
The NX2114 controller IC is a synchronous Buck con- n Synchronous Controller in 8 Pin Package
troller IC designed for step down DC to DC converter n Bus voltage operation from 2V to 25V
applications. Synchronous control operation replaces n Single 5V Supply Operation
the traditional catch diode with an Nch MOSFET result- n Short protection with feedback UVLO
ing in improved converter efficiency.Although the NX2114 n Internal 300kHz for 2114 and 600kHz for 2114A
controller is optimized to convert single 5V bus voltages n Internal Digital Soft Start Function
to supplies as low as 0.8V output voltage, however us- n Shut Down via pulling comp pin low
ing a few external components it can also be used for n Pb-free and RoHS compliant
other input supplies such as 12V input (See NX2113
data sheet for more optimized solution). The NX2114
operates at 300kHz while 2114A is set at 600kHz n
operation which together with less than 50 nS of dead n
band provides an efficient and cost effective solution. n
Other features of the device are:
Internal digital soft start; Vcc undervoltage lock out; Out- n
put undervoltage protection with digital filter and shut- n
down capability via the enable pin.
APPLICATIONS
Graphic Card on board converters
Memory Vddq Supply in mother board applications
On board DC to DC such as
5V to 3.3V, 2.5V or 1.8V
Hard Disk Drive
Set Top Box
TYPICAL APPLICATION
L2 1uH
Vin
+5V C4
47uF,70mohm
R5
10 D1 MBR0530T1
OFF R6 10k
ON
R7
10k
C8
47uF,70mohm
2N3904
C1
47pF
C6
1uF
5
Vcc
7 Comp
C2
1.5nF
R4
22.1k
6
Fb
1
BST
Hdrv 2
SW 8
Ldrv 4
C7
0.1uF
Gnd
3
C5
1uF
M1
L1 1.5uH
M2
Cin
220uF,12mohm
Vout
+1.6V,6A
Co
2 x (220uF,15mohm)
R2
10.2k
R1 10.2k
R3 C3
1.5k 2.2nF
Device
NX2114CSTR
NX2114ACSTR
Figure1 - Typical application of 2114
ORDERING INFORMATION
Temperature
0 to 70oC
0 to 70o C
Package
SOIC-8L
SOIC-8L
Frequency
300kHz
600kHz
Pb-Free
Yes
Yes
Rev. 4.0
06/20/06
1
1 page  
BLOCK DIAGRAM
VCC 5
UVLO
NX2114/2114A
DRIVER
OSC
QS
QR
LATCH
TIMER
0.3V
0.4V
DIGITAL SS
VREF
1 BST
2 Hdrv
8 SW
4 Ldrv
3 GND
7 COMP
6 FB
Figure 1 - Simplified block diagram of the NX2114
Rev. 4.0
06/20/06
5
5 Page 
NX2114/2114A
power stage
FLC
40dB/decade
loop gain
compensator
FESR
20dB/decade
FO=30kHz.
C3 =
1
2× π × R2
×(
1
Fz2
-
1
Fp1
)
= 1 ×( 1 - 1 )
2× π ×10kΩ 6.2kHz 48kHz
=2.2nF
R4 =
VOSC
Vin
×
2 × π × FO
C3
×L
× Cout
=1.7V × 2 × π × 30kHz ×1.5uH × 440uF
5V 2.2nF
=19.2kΩ
Choose C3=2.2nF, R4=22.1kΩ.
5. Calculate C2 with zero Fz1 at 75% of the LC
double pole by equation (11).
FZ1 FZ2
FO FP1 FP2
Figure 10 - Bode plot of Type III compensator
Design example for type III compensator are in
order. The crossover frequency has to be selected as
F <F <F and F <=1/10~1/5F
LC O ESR,
O
s.
1. Calculate the location of LC double pole FLC
and ESR zero FESR.
FLC = 2 × π ×
1
LOUT × COUT
=1
2 × π × 1.5uH × 440uF
= 6.2kHz
FESR
=
1
2 × π × ESR × COUT
=1
2 × π × 7.5mΩ × 440uF
= 48kHz
2. Set R2 equal to10.2kΩ, then R1= 10.2kΩ.
3. Set zero FZ2 = FLC and Fp1 =FESR .
4. Calculate R4 and C3 with the crossover
frequency at 1/10~ 1/5 of the switching frequency. Set
C2
=
1
2 × π × FZ1 × R4
=1
2 × π × 0.75 × 6.2kHz × 22.1kΩ
= 1.55nF
Choose C2=1.5nF.
6. Calculate C1 by equation (14) with pole Fp2 at
half the switching frequency.
C1
=
1
2 × π ×R4
× FP2
=1
2 × π × 22.1kΩ ×150kHz
= 48pF
Choose C =47pF.
1
7. Calculate R by equation (13).
3
R3
=
1
2 × π × FP1 × C3
=1
2 × π × 48kHz × 2.2nF
= 1.5kΩ
Choose R3=1.5kΩ.
Rev. 4.0
06/20/06
11
11 Page | ||
| Páginas | Total 20 Páginas | |
| PDF Descargar | [ Datasheet NX2114A.PDF ] | |
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