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PDF AX9370 Data sheet ( Hoja de datos )
| Número de pieza | AX9370 | |
| Descripción | Universal High Brightness Led Driver | |
| Fabricantes | AXElite | |
| Logotipo |  |
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AX9370
Universal High Brightness Led Driver
GENERAL DESCRIPTION
The AX9370 is a high performance LED lighting controller with PFC integrated which
uses primary-side-control to eliminate opto-coupler and simplify the LED lighting driving
system. AX9370 removes the need for secondary feedback circuitry while achieving
excellent line regulation.
AX9370 integrates power factor correction function and works in boundary conduction
mode (BCM) which can minimize the switching loss, thus increasing efficiency.
In a flyback circuit with the controller AX9370 at BCM operation can also reduce choke
variation and enhance the LED current accuracy for line input voltage variation and output
voltage variation.
Compared with a traditional LED driver IC, AX9370 can achieve the PF>0.95 and
provide accurate constant current <±5% in a universal input voltage range
(90VAC~264VAC).
Thus AX9370 is designed for lowering total costs, size, and components while
simultaneously increasing efficiency and system reliability.
FEATURES
- Primary-side Feedback Constant Current Control
- Universal Rectified 90VAC to 264VAC Input Voltage Range
- Boundary Conduction Mode (BCM) Operation with PFC (>0.95)
- Constant Current Control LED Driver (<±5%)
- Built-in Secondary Short Circuit Protection and Secondary Open Circuit Protection.
- Line Compensation
- Output Voltage Compensation
- LED Series/Parallel Combinations
- SOT-23-6L Package Available
1/12
Axelite Confidential Materials, do not copy or distribute without written consent.
Rev.1.1 Dec.25, 2012
1 page  
AX9370
APPLICATION CIRCUIT
+
Vout
−
Vac
( 90V~264V )
AX9370
5 DMG VDD 4
6 VIN
GAT 3
2 GND
CS 1
Figure 2
APPLICATION INFORMATION
The AX9370 is a high performance LED lighting controller with PFC integrated which
uses primary-side-control to eliminate opto-coupler and simplify the LED lighting driving
system. AX9370 removes the need for secondary feedback circuitry while achieving
excellent line regulation.
AX9370 integrates power factor correction function and works in boundary conduction
mode which can minimize the switching loss, thus increasing efficiency.
1. CS Constant Current Settings
RCS
N1 K
N2 IOUT
K 0.07 :120Hz average constant
When RCS is cut off, CS pin voltage will be pulled up to 5V and then trigger the potection
mode.
2. VIN Input Voltage Sense
The VIN pin is used to achieve power factor compensation and the duty cycle
calculation via feedback phase and the value of the input voltage.
The internal saturation voltage of this pin is 10.5V, if its voltage is over 10.5V, it will be
non-linear modulation. Thus the linear operation range from 3 to 10.5V is recommended.
We recommended resistor value is 18.5k and 660k as a resistor divider.
3. DMG Zero Current Switching and Output Open Circuit Dectation
The main functions are the dectation of secondary zero current switching and the
judgment of secondary short protection.
The internal saturation voltage of this pin is 10.5V, if its voltage is over 10.5V, it will be
non-linear modulation. Thus the linear operation range from 7 to 10.5V is recommended.
We recommended resistor value is 82k and 39k as a resistor divider.
5/12
Axelite Confidential Materials, do not copy or distribute without written consent.
Rev.1.1 Dec.25, 2012
5 Page 
AX9370
※ As shown in figure 6, to minimize the effect of the leakage inductance and EMI, the
coupling between the transformer primary side and the secondary side should be as tight
as possible.
※ As shown in figure 7, when using interleaved winding arrangement, Na and Ns cannot be
separated by inside shading.
NP2
E2
Na
NS
E1
NP1
Bobbin
Figure 6
NP2
Na
E2
NS
E1
NP1
Bobbin
Figure 7
11/12
Axelite Confidential Materials, do not copy or distribute without written consent.
Rev.1.1 Dec.25, 2012
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet AX9370.PDF ] | |
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