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PDF AS1390B Data sheet ( Hoja de datos )
| Número de pieza | AS1390B | |
| Descripción | High Power Boost Controller and Buck Converter | |
| Fabricantes | austriamicrosystems AG | |
| Logotipo |  |
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Datasheet
AS1390A, AS1390B
High Power Boost Controller and Buck Converter for LED Backlight
1 General Description
The AS1390A, AS1390B is a high-power, constant-frequency boost
controller with an integrated buck converter. The AS1390A can be
used for the boost converter in TV sets which are optimized for 2D
and 3D mode. AS1390B is designed for single mode operation.
The continuous conduction mode of the AS1390 provides superior
bandwith and transient response. The two output voltages for the
boost controller (2D and 3D mode) can be programmed with an
external resistor divider.
The buck converter is optimized for suppling a µP with 5V.
The AS1390A is available in a 20-Pin QFN (4x4mm) package, the
AS1390B comes in a 16-pin SOIC package.
2 Key Features
High Efficiency: Up to 95%
Supply Voltage Range: 10V to 30V
Boost Output Current: up to 3A
Continuous Conduction Mode
Undervoltage Lockout with hysteresis
Overvoltage, Overcurrent and Overtemperature Protection
Low Dropout Operation: 90% Duty Cycle
Buck always ON, Boost with enable PIN
Packages:
- 20-Pin QFN (4x4mm)
- 16-pin SOIC
Figure 1. AS1390A - Typical Application
3 Applications
The device is ideal for LED backlighting for LCD - TV sets and
monitors.
www.austriamicrosystems.com/Power-Management/AS1390 Revision 1.04
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1 page  
AS1390A, AS1390B
Datasheet - Electrical Characteristics
6 Electrical Characteristics
VDDH = 24V, EN_BOOST = 5V, unless otherwise noted. Typical values are at TA=25°C. All limits are guaranteed. The parameters with min and
max values are guaranteed with production tests or SQC (Statistical Quality Control) methods.
Table 3. Electrical Characteristics
Symbol
Parameter
Conditions
Min Typ Max Units
TA Operating Temperature Range
-40 +85 °C
TJ Operating Junction Temperature Range
-40 +125 °C
VDDH
Supply Voltage Range 1
10 30 V
VFB Feedback Voltage
1.25 V
IQ
Boost Converter
Quiescent Supply Current
1 mA
VOUT Boost 2
Output Voltage Range
Accuracy
30 90 V
-2 +2 %
IOUT Boost
Output current Boost Converter 3
1000 3000 mA
fSW
Buck Converter
Boost Swichting Frequency
275 kHz
VOUT Buck
Output Voltage Range
Accuracy
IOUT Buck = 50mA
5V
-5.0 +5.0 %
IOUT Buck
Output current Buck Converter
100 mA
fSW Buck Switching Frequency
1000 kHz
RON_Buck
Driver Stage
Driver ON Resistance Buck
3Ω
RSWON1
Driver ON Resistance Top
8Ω
RSWON2
Driver ON Resistance Bottom
8Ω
VDRV,peak Driver Peak Voltage (voltage @ VDDM)
9V
tRISE
Driver Pin Rise Time
CGS = 3nF, VDDM = 9V,
VDRV = 0 to 3V
25 ns
tFALL
Driver Pin Fall Time
Undervoltage Lockout
25 ns
VREF
UVLO Reference Voltage
1.35 V
IHYST
Enable
Hysteresis Current
20 µA
VIH,EN
VIH,MODE
Logic high input threshold
1.8 V
VIL,EN
VIL,MODE
Logic low input threshold
0.8V V
www.austriamicrosystems.com/Power-Management/AS1390 Revision 1.04
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5 Page 
AS1390A, AS1390B
Datasheet - Detailed Description
8.1.2 Undervoltage-Lockout (UVLO)
To enable the usage of the circuit with a wide input voltage range (typ. 12V and 24V), the threshold for undervoltage detection should be
selectable by external components. Therefore a PAD UVLO is implemented, with an external resistor that selects the value of the threshold and
implements also a hysteresis. Till UVLOCO gets deactivated, the threshold is higher, after UVLOCO is 0 (no undervoltage condition), the
threshold is lowered by a switch-on of a constant current source.
If the undervoltage-lockout is not needeed connect the UVLO pin to VDDL.
Figure 19. UVLO - comparator and external resistor divider
Figure 20. UVLO - comparator Output
Following equations can be derived for adjusting the threshold voltages.
Undervoltage threshold High:
VDDH – UVH
=
VREF
×
1
+
R-R---UU----VV---LL---OO----12-
Undervoltage threshold High:
VDDH – UVL = VREF × 1 + R-R---UU----VV---LL---OO----12- – (IHYST × RUVLO1)
Where: IHYST = 20µA
VREF = 1.35V
www.austriamicrosystems.com/Power-Management/AS1390 Revision 1.04
(EQ 3)
(EQ 4)
11 - 20
11 Page | ||
| Páginas | Total 20 Páginas | |
| PDF Descargar | [ Datasheet AS1390B.PDF ] | |
Hoja de datos destacado
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