ncp3120 ON Semiconductor, ncp3120 Datasheet - Page 2

• Manufacturer Part Number: ncp3120
• Description: Dual 2.0 A, Step-down Dc/dc Switching Regulator
• Manufacturer: ON Semiconductor

TRACK 2
TRACK 1
COMP 2
COMP 1
SEQ 2
SEQ1
SS 1
EN 1
EN 2
FB 2
FB 1
SS2
RT
Sequencing 1
Sequencing 2
Power
Power
Tracking Control
Tracking Control
Soft Start &
Soft Start &
(MUX1)
(MUX2)
0 .9 . ref
0 .9 . ref
ref (0.8 V)
Error Amplifier
Error Amplifier
EOTA 1
EOTA 2
10 u
10 u
10u
10u
SHDN 1
pg 1
pg 2
OSCILLATOR
Delay
Delay
Figure 2. Block Diagram
http://onsemi.com
SHDN2
NCP3120
PWM
PWM
SS 1
1 V
0. 5V
FB1
SS 2
0 .5V
2
1V
FB2
180 o
0 o
Protection
Overload
Protection
Overload
R
S
R
S
0 .1. ref
0 .1. ref
SH U TD OWN
TH ER MAL
STAR TU P
UVL O
CON TR OL
CON TR OL
LOGIC 2
LOGIC 1
HS protection 1
SHDN 1
SHDN 2
Falling comp
Falling comp
HS protection 2
SHDN 1
SHDN 2
SHDN1
Reference
0. 8V
AVIN
SHDN2
ref (0 .8V )
ref (0.8 V)
Voltage
Signal
HS 2
HS1
PG 1
VIN
SW 2
PG 2
GND 2
VIN
SW 1
GND 1
AVIN
AGND