Copyright Cirrus Logic, Inc. 2011
(All Rights Reserved)
http://www.cirrus.com
Application Note
DRIVING MOSFETs WITH THE CS1501 & CS1601
1. Introduction
The CS1501 & CS1601 are high-performance digital power factor correction (PFC) controllers designed for switching mode pow-
er supply (SMPS) & lighting applications. This papers discusses the basics of driving power MOSFETs, including some guide-
lines for layout & component choices.
2. CS1501 & CS1601 Gate Drive
The CS1501 & CS1601 internal gate driver is a dual MOSFET between VDD & GND.
The CS1501 & CS1601 parameters for its internal gate drive are listed below.
1. C
L
is defined as the capacitive load that the IC drives. For test purposes, load capacitance (C
L
) is 1 nF and is
connected as shown in the following diagram.
Parameter Condition Symbol Min Typ Max Unit
PFC Gate Drive
Output Source Resistance I
GD
= 100 mA, V
DD
=13V R
OH
-9-Ω
Output Sink Resistance I
GD
=-200mA,V
DD
=13V R
OL
-6-Ω
Rise Time
1
C
L
=1nF,V
DD
=13V t
r
-3245ns
Fall Time
1
C
L
=1nF,V
DD
=13V t
f
-1525ns
Output Voltage Low State I
GD
=-200mA,V
DD
=13V Vol - 0.9 1.3 V
Output Voltage High State I
GD
= 100 mA, V
DD
=13V Voh 11.3 11.8 - V
CS1501
CS1601
8
VDD
V
DD
7
GD
6
GND
GD OUT
GD
GND
CS
VDD
Buffer
S
1
R
1
R
2
R
3
TP
C
L
1nF
+15V
-15V
S
2
V
DD
AN352
MAR ‘11
AN352REV1
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