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PDF ACT30 Data sheet ( Hoja de datos )
| Número de pieza | ACT30 | |
| Descripción | HIGH PERFORMANCE OFF-LINE CONTROLLER | |
| Fabricantes | Active-Semi | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de ACT30 (archivo pdf) en la parte inferior de esta página. Total 9 Páginas | ||
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Datasheet
Rev 2, 5/2005
ACT30
ACT30
HIGH PERFORMANCE OFF-LINE CONTROLLER
ActiveSwitcherTM IC Family
FEATURES
Lowest Total Cost Solution
0.15W Standby Power
Emitter Drive Allows Safe NPN Flyback Use
Hiccup Mode Short Circuit
Current Mode Operation
www.DataSheeOtv4Ue.rc-Comurrent Protection
Under-voltage Protection with Auto-restart
Proprietary Scalable Output Driver
Flexible Packaging Options (including TO-92)
65kHz or 100kHz Switching Frequency
Selectable 0.4A to 1.2A Current Limit
APPLICATIONS
Battery Chargers
Power Adaptors
Standby Power Supplies
Appliances
Universal Off-line Power Supplies
GENERAL DESCRIPTION
The ACT30 is a high performance
green-energy offline power supply controller. It
features a scalable driver for driving external
NPN or MOSFET transistors for line voltage
switching. This proprietary architecture enables
many advanced features to be integrated into a
small package (TO-92 or SOT23-5), resulting in
lowest total cost solution.
The ACT30 design has 6 internal terminals
and is a pulse frequency and width modulation IC
with many flexible packaging options. One
combination of internal terminals is packaged in
the space-saving TO-92 package (A/B/C/D
versions) for 65kHz or 100kHz switching
frequency and with 400mA or 800mA current limit.
The E version (SOT23-5) can be configured for
higher current limit.
Consuming only 0.15W in standby, the IC
features over-current, hiccup mode short circuit,
and under-voltage protection mechanisms.
The ACT30 is ideal for use in high
performance universal adaptors and chargers.
For highest performance versus cost and
smallest PCB area, use the ACT30 in
combination with the ACT32 CV/CC Controller.
Figure 1. Simplified Application Circuit
Active-Semi, Inc.
-1-
Confidential to Micro Bridge
1 page  
ACT30
VAC
VDRV1
VDD
IPRIMARY
VOUT
www.DataSheet4U.com
pulse-skipped
VDRVST
5V
Figure 3. Startup Waveforms
NORMAL OPERATION
In normal operation, the feedback signal from
the secondary side is transmitted through the
optocoupler as a current signal into VDD pin,
which has dynamic impedance of 9kΩ. The
resulting VDD voltage affects the switching of the
IC. As seen from the Functional Block Diagram,
the Current Limit VC Generator uses the VDD
voltage difference with 4.75V to generate a
proportional offset at the negative input of the
Error Comparator.
The drivers turn on at the beginning of each
switching cycle. The current sense resistor
current, which is a fraction of the transformer
primary current, increases with time as the
primary current increases. When the voltage
accross this current sense resistor plus the
oscillator ramp signal equals Error Comparator's
negative input voltage, the drivers turn off. Thus,
the peak DRV1 current has a negative voltage
coefficent of -0.29A/V and can be calculated
from the following:
IDRV1PEAK = 0.29A/V • (4.75V – VDD)
for VDD < 4.75V and duty cycle < 50%.
When the output voltage is lower than
regulation, the current into VDD pin is zero and
VDD voltage decreases. At VDD = VUV = 3.35V, the
peak DRV1 current has maximum value of
400mA.
CURRENT LIMIT ADJUSTMENT
The IC's proprietary driver arrangement
allows the current limit to be easily adjusted
between 400mA and 1.2A. To understand this,
the drivers have to be utilized as linear resistive
devices with typically 3.6Ω (rather than as digital
output switches). The current limit can then be
calculated through linear combination as shown
in Figure 4. For TO-92 package, the ACT30A/C
are preprogrammed to 400mA current limit and
DRV1
DRV2
ILIM = 400mA
DRV1
DRV2
RD
DRV1
DRV2
DRV1
DRV2
RD
ILIM
=
400mA
•
7.2Ω
3.6Ω
+
+
RD
RD
ILIM = 800mA
ILIM
=
400mA • 2 +
RD
3.6Ω
Figure 4. Driver Output Configurations
Active-Semi, Inc.
- 5 - Confidential to Micro Bridge
5 Page | ||
| Páginas | Total 9 Páginas | |
| PDF Descargar | [ Datasheet ACT30.PDF ] | |
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