NCP4330 Datasheet, PDF (1/18 Pages) ON Semiconductor – Post Regulation Driver

NCP4330
Post Regulation Driver
The NCP4330 houses a dual MOSFET driver intended to be used as
a companion chip in AC−DC or DC−DC multi−output post regulated
power supplies. Being directly fed by the secondary AC signal, the
device keeps power dissipation to the lowest while reducing the
surrounding part count. Furthermore, the implementation of a
N−channel MOSFET gives NCP4330−based applications a significant
advantage in terms of efficiency.
Features
• Undervoltage Lockout
• Thermal Shutdown for Overtemperature Protection
• PWM Operation Synchronized to the Converter Frequency
• High Gate Drive Capability
• Bootstrap for N−MOSFET High−Side Drive
• Over−Lap Management for Soft Switching
• High Efficiency Post−Regulation
• Ideal for Frequencies up to 400 kHz
• This is a Pb−Free Device
http://onsemi.com
MARKING
DIAGRAM
8
1
SO−8
D SUFFIX
CASE 751
8
4330D
ALYW
1
4330D
A
L
Y
W
= Device Number
= Assembly Location
= Wafer Lot
= Year
= Work Week
Typical Applications
• ATX 3V3 Post−Regulation
• Offline SMPS with MAGAMP Post−Regulation
• Multi−Outputs DC−DC Converters
V_DD
V_DD
Vref, UVDth
Band−Gap
AR2
RST
V_DD
Undervoltage Detection
(UVD high if V_DD < 4.9 V)
UVD
HS_DRV and
LS_DRV low
RESET Block
Level
Shifter
Buffer
U1
INVERTER
C_ramp
I_ramp
Iramp
U4
U3
2.5 V/1.5 V
+
Iramp
−
OR
Hysteresis
V_DD ^Comparator
V_DD
AR3
GND
Current
Mirror
Buffer
PIN CONNECTIONS
HS_DRV 1
BST 2
RST 3
BST
C_ramp 4
8 GND
7 LS_DRV
6 V_DD
5 I_ramp
HS_DRV
(Top View)
ORDERING INFORMATION
Device
Package
Shipping^†
NCP4330DR2G SO−8 2500 / Tape & Reel
(Pb−Free)
†For information on tape and reel specifications,
including part orientation and tape sizes, please
refer to our Tape and Reel Packaging Specification
Brochure, BRD8011/D.
LS_DRV
Figure 1. Block Diagram
© Semiconductor Components Industries, LLC, 2005
1
August, 2005 − Rev. 0
Publication Order Number:
NCP4330/D