Diodes AM4964 - Manual (Page 4)

AM4964
Document number: DS37241 Rev. 2 - 2
4 of 21
www.diodes.com
June 2014
© Diodes Incorporated
AM4964
A Product Line of
Diodes Incorporated
N
E
W
P
R
O
D
U
C
T
Functional Block Diagram
Thermal
Shutdown
Control
Circuit
Triangle Wave
VCC
RADJ
VMIN
PWM
CF
OUT1
OUT2
FG
3
Pre-
driver
V+
4
5
6
7
8
9
14
19
V+ V+
V+
V+
104k
42k
90k
54k
51k
56k
93k
18k
17k
RT
TL
10
TH
17
Vreg
Lock Shutdown
and
Auto Restart
Hysteresis Amp
CT
IN +
IN -
PGND
11
13
15 2
TA
1.25V
HB
18
12
SGND
16
Truth Table
Items IN- IN+ CF CT OUT1 OUT2 FG Mode
1 H L
L
L
H L L Rotation
2 L H L H Off PWM Off
3 H L
H
Off L L Rotation Recirculation
4 L H L Off Off PWM Off
5 H L
L H
H Off L
Lock Protection
6 L H Off H Off