SP6138 Datasheet, PDF (14/17 Pages) Sipex Corporation – Synchronous Buck Controller

Gain
(dB)
Condition:
C22 >> CP1, R1 >> RZ3
APPLICATION INFORMATION
Error Amplifier Gain
Bandwidth Product
20 Log (RZ2/R1)
Frequency
(Hz)
Figure 6: Bode Plot of Type III Error Amplifier Compensation
Note: Loop Compensation component calculations discussed in this
Datasheet can be quickly iterated with the Type III Loop Compensation
Calculator on the web at:
www.sipex.com/files/Application-Notes/TypeIIICalculator.xls
Manufacturer/Part No.
Cooper DR73-2R2
Manufacturer/Part No.
AVX 08053D475MAT
AVX 08056D226MAT
Manufacturer/Part No.
Vishay Si7214DN
INDUCTORS - SURFACE MOUNT
Inductance
(uH)
2.2
Series R
Inductor Specification
Isat
Size
Inductor Type
mOhms
(A)
LxW(mm) Ht.(mm)
16.50
5.5
7.6x6.0 3.6 Shielded Ferrite Core
CAPACITORS - SURFACE MOUNT
Capacitance
(uF)
4.7
22
MOSFET
N-Channel
ESR
Mohms (max)
5
5
RDS(on)
mΩ (max)
47
Capacitor Specification
Ripple Current Size
Voltage Capacitor
(A) @ 5^oC rise ^{LxW(mm) Ht.(mm) (V)}
Type
1.70 2.01X1.25 1.25 25.0 X5R Ceramic
2.60 2.01X1.25 1.25 6.3 X5R Ceramic
MOSFETS - SURFACE MOUNT
MOSFET Specification
ID Current
Qg
Voltage Foot Print
(A)
nC (Typ) nC (Max) (V)
5.9
4.2
6.5
30
PowerPAK
1212-8
Manufacturer
Website
www.cooperet.com
Manufacturer
Website
www.avx.com
www.avx.com
Manufacturer
Website
www.vishay.com
Note: Components highlighted in bold are those used on the SP6138 Evaluation Board.
Table 1. Input and Output Stage Components Selection Charts
Oct 24-06 Rev J
SP6138 Synchronous Buck Controller
14
© 2006 Sipex Corporation