nx2147 Microsemi Corporation, nx2147 Datasheet - Page 6

• Manufacturer Part Number: nx2147
• Description: Single Channel Mobile Pwm Controller With Dynamic Voltage Adjustment
• Manufacturer: Microsemi Corporation

BLOCK DIAGRAM
Rev. 1.6
03/09/09
Rev. 1.8
12/28/09
VIN
VREF_OC(10)
R1
R2
AGND(PAD)
GPIO0(14)
GPIO1(6)
VCC(2)
ENSW
/MODE(15)
TON(16)
DO(5)
D1(4)
VP(3)
VOUT
VREF
VCC
soft start
1M
1M
ON time
genearation
pulse
OCP_COMP
FBUVLO_latch
Bias
OVP
start
SELECTION
Figure 2 - Simplified block diagram of the NX2147
MODE
SCHIMTTER
SCHIMTTER
TRIGGER
TRIGGER
4.3/4.1
FBUVLO_latch
POR
Disable
PFM_nonultrasonic
Mini offtime
400ns
1.25*Vref/0.7VREF
Sync
Thermal
shutdown
R
S
Disable_B
VOUT
0.7*Vref
Q
FB
start
OCP_COMP
HD
VREF_OC
POR
Diode
emulation
ODB
HD_IN
R1+R2
FET Driver
start
VOUT
HD
8k
SW(11)
PGND(7)
LDRV(8)
VOUT(1)
BST(13)
PVCC(9)
HDRV(12)
5V
NX2147
VIN
1.8V
6