nx2138 Microsemi Corporation, nx2138 Datasheet - Page 6

• Manufacturer Part Number: nx2138
• Description: Single Channel Mobile Pwm Controller
• Manufacturer: Microsemi Corporation

BLOCK DIAGRAM
Rev. 1.6
12/09/09
VIN
ENSW
/MODE(15)
PGOOD(4)
AGND(6)
VOUT
VCC(2)
TON(16)
FB(3)
VOUT
VCC
soft start
1M
1M
VREF=0.75V
ON time
genearation
pulse
OCP_COMP
Bias
OVP
start
FBUVLO_latch
SELECTION
SS_finished
MODE
Figure 2 - Simplified block diagram of the NX2138
4.3/4.1
POR
FBUVLO_latch
Disable
PFM_nonultrasonic
Mini offtime
400ns
1.25*Vref/0.7VREF
0.9*Vref
Sync
Thermal
shutdown
R
S
Disable_B
FB
Q
0.7*Vref
start
FB
OCP_COMP
HD
POR
Diode
emulation
ODB
HD_IN
FET Driver
start
VOUT
HD
SW(11)
OCSET(10)
PGND(7)
LDRV(8)
VOUT(1)
BST(13)
PVCC(9)
HDRV(12)
5V
NX2138
VIN
1.8V
6