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PDF AP3768 Data sheet ( Hoja de datos )
| Número de pieza | AP3768 | |
| Descripción | LOW-POWER OFF-LINE PRIMARY SIDE REGULATION CONTROLLER | |
| Fabricantes | BCD Semiconductor | |
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Preliminary Datasheet
LOW-POWER OFF-LINE PRIMARY SIDE REGULATION CONTROLLER
General Description
Features
AP3768
The AP3768 is a high performance AC/DC power sup-
ply controller for battery charger and adapter applica-
tions. The device uses Pulse Frequency Modulation
(PFM) method to build discontinuous conduction
mode (DCM) flyback power supplies.
The AP3768 provides accurate constant voltage, con-
stant current (CV/CC) regulation without requiring an
opto-coupler and secondary control circuitry. It also
eliminates the need of loop compensation circuitry
while maintaining stability. The AP3768 achieves
excellent regulation and high average efficiency, yet
meets the requirement for no-load consumption less
than 30mW.
The AP3768 has the built-in programmable cable volt-
age drop compensation function, which make it flexi-
ble to accommodate various cables with different
gauges and lengths.
· Primary Side Control for Eliminating Opto-cou-
pler and Secondary CV/CC Control Circuitry
· 30mW No-load Input Power
· Programmable Output Cable Voltage Drop Com-
pensation
· Proprietary CC Tightening Technique to Achieve
Vertical CC Profile
· Compensation for External Component Tempera-
ture Variations
· Flyback Topology in DCM Operation
· Random Frequency Adjustment to Reduce Sys-
tem EMI
· Built-in Soft Start
· Over Voltage Protection
· Short Circuit Protection
· SOIC-8 Package
Applications
The AP3768 is available in SOIC-8 package.
· Adapter/Chargers for Cell/Cordless Phones,
PDAs, MP3 and Other Portable Apparatus
· LED Driver
· Standby and Auxiliary Power Supplies
Aug. 2010 Rev. 1. 0
SOIC-8
Figure 1. Package Type of AP3768
BCD Semiconductor Manufacturing Limited
1
1 page  
Preliminary Datasheet
LOW-POWER OFF-LINE PRIMARY SIDE REGULATION CONTROLLER AP3768
Electrical Characteristics
(VCC=15V, TA=25oC, unless otherwise specified.)
Parameter
Symbol
Conditions
Min Typ Max Unit
UVLO SECTION
Start-up Threshold
VTH (ST)
17 18.5 21
V
Minimal Operating Voltage
Reference Voltage
VOPR(min)
8.2 9.2 10.2 V
BIAS Pin Voltage
VBIAS RBIAS=200kΩ, After Turn On
1.0
1.1
1.2
V
STANDBY CURRENT SECTION
Start-up Current
IST
VCC=VTH (ST)-0.5V,
RBIAS=200kΩ,
Before start-up
0.6 µA
Operating Current
DRIVE OUTPUT SECTION
OUT Maximum Current Source
CURRENT SENSE SECTION
Current Sense Threshold
Pre-Current Sense
Leading Edge Blanking
ICC(OPR) RBIAS=200kΩ
IOUT RBIAS=200kΩ
VCS
VCS(PRE)
390 480 µA
28 36 44 mA
490 513 535 mV
390 413 435 mV
500 ns
FEEDBACK INPUT SECTION
Feedback Pin Input Leakage
Current
IFB
VFB=4V
1.8 2.4 3.0 µA
Feedback Threshold
VFB
Enable Turn-on Voltage
VFB(EN)
OUTPUT VOLTAGE COMPENSATION SECTION
CPR Voltage
VCPR
Dons (Tons/T):
from 55% to 0.02%
3.97 4.03 4.09
-2.0 -1.7 -1.4
V
V
1.5 3.5 V
CPR Sink Current
PROTECTION SECTION
ICPR
200 µA
Over Voltage Protection
VFB(OVP)
7 8 9V
Aug. 2010 Rev. 1. 0
BCD Semiconductor Manufacturing Limited
5
5 Page | ||
| Páginas | Total 10 Páginas | |
| PDF Descargar | [ Datasheet AP3768.PDF ] | |
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