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AX2535 Schematic ( PDF Datasheet ) - AXElite

Teilenummer AX2535
Beschreibung High Precision CC/CV Primary-Side PWM Power Switch
Hersteller AXElite
Logo AXElite Logo 




Gesamt 12 Seiten
AX2535 Datasheet, Funktion
AX2535
High Precision CC/CV Primary-Side PWM
Power Switch
GENERAL DESCRIPTION
AX2535 is a high performance offline PWM Power switch for low power AC/DC
charger and adapter applications. It operates in primary-side sensing and regulation.
Consequently, the photo-coupler and TL431 could be eliminated. Proprietary Constant
Voltage (CV) and Constant Current (CC) control is integrated as shown in the figure
below.
In CC control, the current and output power setting can be adjusted externally by the
sense resistor RS at CS pin. In CV control, multi-mode operations are utilized to achieve
high performance and high efficiency. In addition, good load regulation is achieved by the
built-in cable drop compensation. Device operates in PFM in CC mode as well at large
load condition and it operates in PWM with frequency reduction at light/medium load.
AX2535 offers power on soft start control and protection coverage with
auto-recovery features including Cycle-by-Cycle current limiting, VDD OVP, VDD clamp
and UVLO. Excellent EMI performance is achieved by frequency shuffling technique.
High precision constant voltage (CV) and constant current (CC) can be achieved by
AX2535.
VO
± 5%
IO
ICC
Fig.1. CC/CV control characteristic
Axelite Confidential Materials, do not copy or distribute without written consent.
1/12






AX2535 Datasheet, Funktion
AX2535
FUNCTION DESCRIPTIONS
AX2535 is a cost effective PWM power switch optimized for off-line low power
AC/DC applications including battery chargers and adapters. It operates in primary-side
sensing and regulation, thus photo-coupler and TL431 are not required. Proprietary
built-in CV and CC control can achieve high precision CC/CV control meeting most
adapter and charger application requirements.
Startup Current and Startup Control
Startup current of AX2535 is designed to be very low so that VDD could be charged
up above UVLO threshold and startup quickly. A large value startup resistor can therefore
be used to minimize the power loss in application.
Operating Current
The operating current of AX2535 is as low as 2.5mA. Good efficiency is achieved
with the low operating current together with “Multi-Modecontrol features.
Soft Start
AX2535 features an internal soft start to minimize the component electrical
over-stress during power on startup. As soon as VDD reaches UVLO (OFF), the control
algorithm will ramp peak current voltage threshold gradually from nearly zero to normal
setting of 0.90V. Every restart is a soft start.
CC/CV Operation
AX2535 is designed to produce good CC/CV control characteristic as shown in the
Fig.1. In charger applications, a discharged battery charging starts in the CC portion of
the curve until it is nearly full charged and smoothly switches to operate in CV portion of
the curve. In an AC/DC adapter, the normal operation occurs only on the CV portion of the
curve. The CC portion provides output current limiting. In CV operation, the output voltage
is regulated through the primary-side control. In CC operation mode, AX2535 will regulate
the output current constant regardless of the output voltage drop.
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Axelite Confidential Materials, do not copy or distribute without written consent.
Rev.1.0 Aug.02, 2011

6 Page









AX2535 pdf, datenblatt
PACKAGE OUTLINES
AX2535
b
D
7 (4X)
L
DETAIL A
θ
e
y
Symbol
A
A1
A2
C
D
E
H
L
b
e
y
θ
Dimensions in Millimeters
Min. Nom. Max.
- - 1.75
0.1 - 0.25
1.25 -
-
0.1 0.2 0.25
4.7 4.9
5.1
3.7 3.9
4.1
5.8 6
6.2
0.4 - 1.27
0.31 0.41
0.51
1.27 BSC
- - 0.1
0O -
8O
Mold flash shall not exceed 0.25mm per side
JEDEC outline: MS-012 AA
DETAIL A
Dimensions in Inches
Min. Nom. Max.
- - 0.069
0.04 - 0.1
0.049
-
-
0.0075 0.008 0.01
0.185
0.193
0.2
0.146
0.154 0.161
0.228
0.236 0.244
0.015 - 0.05
0.012
0.016
0.02
0.050 BSC
- - 0.004
0O - 8O
12/12
Axelite Confidential Materials, do not copy or distribute without written consent.
Rev.1.0 Aug.02, 2011

12 Page





SeitenGesamt 12 Seiten
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