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PDF AS3834 Data sheet ( Hoja de datos )
| Número de pieza | AS3834 | |
| Descripción | 4 channel high-precision LED controller | |
| Fabricantes | austriamicrosystems | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de AS3834 (archivo pdf) en la parte inferior de esta página. Total 21 Páginas | ||
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1 page  
AS3834
Datasheet - Pin Assignments (Top View)
4.1 Pin Descriptions
Table 1. Pin Descriptions
Pin
Number
AS3834
TQFP-32
29
30
31
Pin
Number
AS3834
SOIC-28
1
2
3
Pin Name
VSS
B4
E4
1 4 xFAULT
2 5 ISET
3 6 UVLO
4 7 COMP
5 8 SENSE
6 9 FB
7 10 VDDL
8 11 GATE
10 12 PGND
11 13 VDDM
12 14 VDDH
14 15 VDDH_HC
15 16
VTH
16 17 PWM1
17 19 PWM2
18 20 PWM3
19 21 PWM4
21 22 VSS
22 23
E2
23 24
B2
24 25
B1
25 26
E1
26 27
E3
27 28
B3
Pin Type
Description
P
A_I/O
A_I/O
DO_OD
A_I/O
A_I/O
A_I/O
A_I/O
A_I/O
A_I/O
A_I/O
P
P
P
P
A_I/O
DI_PD
DI_PD
DI_PD
DI_PD
P
A_I/O
A_I/O
A_I/O
A_I/O
A_I/O
A_I/O
Analog Ground
Base 4. Connect to base of external transistor.
Emitter 4. Connect to emitter of external transistor.
Fault output. Active low.
Current setting. Connect current setting resistor.
Undervoltage lockout input.
Compensation network. Connect compensation network.
Current sense input. Provide a short, direct PCB path between
this pin and the positive side of the current sense resistor.
Output voltage feedback input. Input for voltage divider.
Connect voltage divider output as short as possible to this pin
Voltage regulator output 3.3V. Connect 2.2µ F decoupling capacitor to GND
Gate driver output.
Power Ground
Voltage regulator output. Connect 2.2µ F decoupling capacitor to GND
Supply voltage. Connect 1µ F decoupling capacitor to GND
Voltage regulator Input. Connect 2.2µ F decoupling capacitor to GND
Reference input for overtemperature detection.
PWM input 1. PWM input for channel 1
PWM input 2. PWM input for channel 2
PWM input 3. PWM input for channel 3
PWM input 4. PWM input for channel 4
Analog Ground
Emitter 2. Connect to emitter of external transistor.
Base 2. Connect to base of external transistor.
Base 1. Connect to base of external transistor.
Emitter 1. Connect to emitter of external transistor.
Emitter 3. Connect to emitter of external transistor.
Base 3. Connect to base of external transistor.
A_I/O...Analog pin, P...Power pin, DO...digital output, DO_OD...digital output open drain, DI...digital input,
DI_PU...digital input with pullup resistor, DI_PD...digital input with pull down resistor
Revision 1.6
4 - 20
5 Page 
AS3834
Datasheet - Detailed Description
8 Detailed Description
8.1 Precision current output
Figure 9. Current output stage
The LED-current is derived from either Rset using the following equation
ILED = RATIO × Iset
=
RATIO × V----s---e--t
Rset
=
500 × -1---.-2---V---
RSET
(EQ 1)
Iset is protected against a short to ground. In the case of a ground short the current Iset is limited to 660uA and the LED-current to 330mA.
Iset has a lower limit of 6uA with a 1uA hysteresis.This sets the lower limit of the LED-current to 3mA with Rset=200kΩ. If Rset is large than
200kΩ, the LED-current is set to 0mA.
Revision 1.6
10 - 20
11 Page | ||
| Páginas | Total 21 Páginas | |
| PDF Descargar | [ Datasheet AS3834.PDF ] | |
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