4

Oct 3-06 Rev L

SP636 Synchronous Buck Controller

© 2006 Sipex Corporation

APPLICATION INFORMATION

Frequency

(Hz)

Error Amplifier Gain

Bandwidth Product

Condition:

C22 >> CP1, R1 >> RZ3

20 Log (RZ2/R1)

Gain

(dB)

Figure 6: Bode Plot of Type III Error Amplifier Compensation

Table 1. Input and Output Stage Components Selection Charts

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

Series R

Isat

Manufacturer

m



(A)

LxW(mm)

Ht.(mm)

Website

2.2

Inter-

Technical

SC7232-2R2M

10.4

13.00

7.2x6.6

3.20

ESR

Ripple Current

Voltage

Capacitor

Manufacturer

 (max) (A) @ 45°C LxW(mm) Ht.(mm)

(V)

Type

Website

22

TDK

C3225X5R1C226M

0.005

4.00

3X2

2.00

16.0

X5R Ceramic

www.TDK.com

100

TDK

C3225X5R0J107M

0.005

4.00

3X2

2.00

6.3

X5R Ceramic

www.TDK.com

RDS(on)

ID Current

Voltage

Foot Print

Manufacturer

 (max)

(A)

nC (Typ)

nC (Max)

(V)

Website

N-Ch

VISHAY

Si4354DY

18.50

9.0

7.0

10.5

30.0

SO-8

www.vishay.com

N-Ch

VISHAY

Si4886DY

13.5

11.0

14.5

20.0

30.0

SO-8

www.vishay.com

INDUCTORS - SURFACE MOUNT

Inductance

(uH)

Part No.

Inductor Specification

Size

Inductor Type

Manufacturer

CAPACITORS - SURFACE MOUNT

Capacitance

(uF)

Part No.

Capacitor Specification

Size

Manufacturer

MOSFETS - SURFACE MOUNT

MOSFET

Part No.

MOSFET Specification

Qg

Manufacturer