Datasheet

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D at ash ee t
A S1 3 9 0 A , A S1 3 9 0 B
Hi g h P o w e r B o o s t C o n t r o lle r a n d B u c k C o n v e r te r f o r L E D B a c k lig h t
2 Key Features
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.
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:
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The AS1390A is available in a 20-Pin QFN (4x4mm) package, the
AS1390B comes in a 16-pin SOIC package.
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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.
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1 General Description
- 20-Pin QFN (4x4mm)
- 16-pin SOIC
3 Applications
The device is ideal for LED backlighting for LCD - TV sets and
monitors.
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Figure 1. AS1390A - Typical Application
www.austriamicrosystems.com/Power-Management/AS1390
Revision 1.04
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AS1390A, AS1390B
Datasheet - A p p l i c a t i o n s
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Figure 2. AS1390B - Typical Application
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Revision 1.04
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AS1390A, AS1390B
Datasheet - P i n A s s i g n m e n t s
4 Pin Assignments
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Figure 3. Pin Assignments (Top View)
4.1 Pin Descriptions
Pin Number
AS1390A AS1390B
13
5
3
10
6
12
8
7
9
10
11
2
13
-
VDDH
UVLO
COMP_2D
COMP_3D
VBIAS
VDDL
VDDM
FB_2D
FB_3D
GATE
SENSE_2D
SENSE_3D
SENSE_GND
P
A I/O
A I/O
A I/O
A I/O
A I/O
A I/O
A I/O
A I/O
A I/O
A I/O
A I/O
A I/O
LX
A I/O
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1
6
1, 16
4
Pin Typ
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19
14
17
5
4
15
Pin Name
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Table 1. Pin Descriptions
9
7
3
14
FB_BUCK
VDDHP
PGND
AGND
A I/O
P
P
P
12
15
EN_BOOST
D IN
13
-
MODE_3D
D IN
-
Exposed Pad
n.c.
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2
20
16
11
Description
Supply Voltage
Undervoltage Lockout
Compensation Network 2D. default
Compensation Network 3D
High Side Regulator Output. Connect this pin to the Supply rail via a capacitor.
Internal Regulator Output
Drive Voltage Regulator Output
FB Input 2D. default
FB Input 3D
Gate Driver Output
Current Sense Input 2D. default
Current Sense Input 3D
Current Sense Input GND. (only for AS1390A)
Inductor Connector. Connect an inductor from LX to the output of the buck
converter
Feedback Buck Pin. Connect this pin to the output of the buck converter
Supply for DCDC Buck-Converter
Power Ground
Analog Ground
Enable. Enables the Boost-Controller.
1 = Normal operation;
0 = Shutdown;
Selection for 3D Mode. (only for AS1390A)
1 = 3D;
0 = 2D;
Exposed Pad. This pad is not connected internally. Can be left floating or connect to
GND to achieve an optimal thermal performance.
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AS1390A, AS1390B
Datasheet - A b s o l u t e M a x i m u m R a t i n g s
5 Absolute Maximum Ratings
Stresses beyond those listed in Table 2 may cause permanent damage to the device. These are stress ratings only, and functional operation of
the device at these or any other conditions beyond those indicated in Electrical Characteristics on page 5 is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect device reliability.
Table 2. Absolute Maximum Ratings
Max
Units
VDDH to AGND
40
V
VDDL to AGND
5.0
V
VDDM to AGND
20
V
VDDH - 5.0
VDDH + 0.3
V
PGND to AGND
-0.3
+0.3
V
EN_BOOST, FB_2D, FB_3D, FB_BUCK
AGND - 0.3
VDD + 0.3
V
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VBIAS to AGND
Input Current (latch-up immunity)
100
mA
Human Body Model @ VDDH, VDDM, LX,
VBIAS, GATE, VDDHP
4
kV
Human Body Model all other pins
2
kV
+150
ºC
+150
ºC
Electrostatic Discharge
Notes
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Parameter
Electrical Parameters
-100
Norm: JEDEC 78
Norm: MIL 883 E method 3015
Temperature Ranges and Storage Conditions
Junction Temperature (TJ-MAX)
Storage Temperature Range
-65
Package Body Temperature
Humidity non-condensing
5
+260
ºC
85
%
1
Represents a max. floor life time of unlimited
for 20-Pin QFN (4x4mm)
3
Represents a max. floor life time of 168h
for 16-pin SOIC
Moisture Sensitive Level
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The reflow peak soldering temperature (body
temperature) specified is in accordance with IPC/
JEDEC J-STD-020 “Moisture/Reflow Sensitivity
Classification for Non-Hermetic Solid State
Surface Mount Devices”.
The lead finish for Pb-free leaded packages is
matte tin (100% Sn).
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Revision 1.04
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AS1390A, AS1390B
Datasheet - E l e c t r i c a l C h a r a c t e r i s t i c s
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
Parameter
Conditions
TA
Operating Temperature Range
-40
TJ
Operating Junction Temperature Range
-40
1
Min
Typ
Supply Voltage Range
10
VFB
Feedback Voltage
1.25
IQ
Quiescent Supply Current
1
Boost Converter
Output Voltage Range
2
30
Accuracy
-2
+85
°C
+125
°C
30
V
V
mA
90
V
+2
%
3000
mA
IOUT Buck
Output current Buck Converter
100
mA
fSW
Buck Switching Frequency
1000
kHz
RON_Buck
Driver ON Resistance Buck
3
Ω
RSWON1
Driver ON Resistance Top
8
Ω
RSWON2
Driver ON Resistance Bottom
8
Ω
VDRV,peak
Driver Peak Voltage (voltage @ VDDM)
9
V
tRISE
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VOUT Boost
Units
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VDDH
Max
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Symbol
Driver Pin Rise Time
25
ns
Driver Pin Fall Time
25
ns
UVLO Reference Voltage
1.35
V
Hysteresis Current
20
µA
IOUT Boost
Output current Boost Converter
fSW
Buck Converter
VOUT Buck
IHYST
kHz
Output Voltage Range
5
V
IOUT Buck = 50mA
-5.0
CGS = 3nF, VDDM = 9V,
VDRV = 0 to 3V
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Undervoltage Lockout
Enable
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tFALL
1000
Boost Swichting Frequency
Accuracy
Driver Stage
VREF
3
Logic high input threshold
VIL,EN
VIL,MODE
Logic low input threshold
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VIH,EN
VIH,MODE
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+5.0
1.8
V
0.8V
Revision 1.04
%
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AS1390A, AS1390B
Datasheet - E l e c t r i c a l C h a r a c t e r i s t i c s
Table 3. Electrical Characteristics
Symbol
Parameter
Conditions
Min
Typ
Max
Units
Thermal Protection
Thermal Shutdown Threshold
140
°C
Thermal Shutdown Hysteresis
30
°C
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1. Depending on external components an extended Supply Voltage Range up to 40V is possible.
2. Guaranteed by design and characterisation. Depending on external components an extended Output Voltage Range up to 200V is possible.
3. Depending on parameters of external transistor and max. allowed heat dissipation of the external transistor.
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Revision 1.04
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AS1390A, AS1390B
Datasheet - O p e r a t i n g C h a r a c t e r i s t i c s
7 Operating Characteristics
VOUT Boost = 60V, IOUT Boost = 1A, VOUT Buck = 5V, IOUT Buck = 50mA, TA = +25°C (unless otherwise specified);
100
90
90
80
80
70
60
50
40
30
70
60
50
40
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Output Voltage (V)
100
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Figure 5. Boost - Output Voltage vs. Output Current; VIN = 12V
30
20
20
10
10
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Efficiency (%)
Figure 4. Boost - Efficiency vs. Output Current; VIN = 12V
0
0
0.1
1
10
0
0.25
0.5
Output Current (A)
Figure 6. Boost - Efficiency vs. Output Current; VIN = 24V
100
1.25
1.5
1.75
2
28
30
Figure 7. Boost - Efficiency vs. Input Voltage
95
80
90
70
Efficiency (%)
Efficiency (%)
1
100
90
60
50
40
30
20
85
80
75
70
65
60
10
55
0
50
1
10
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0.1
10
12
14
16
Output Current (A)
22
24
26
80
75
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75
20
Figure 9. Boost - VOUT vs. Temp.; VIN = 24V, IOUT = 200mA
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80
18
Input Voltage (V)
Figure 8. Boost - Output Voltage vs. Output Current; VIN = 24V
Output Voltage (V)
70
65
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Output Voltage (V)
0.75
Output Current (A)
60
55
50
45
70
65
60
55
50
45
40
40
0
0.5
1
1.5
2
2.5
3
3.5
4
Output Current (A)
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-30
-15
0
15
30
45
60
75
90
Temperature (ΣC)
Revision 1.04
7 - 20
AS1390A, AS1390B
Datasheet - O p e r a t i n g C h a r a c t e r i s t i c s
Figure 10. Buck - Efficiency vs. Output Current; VIN = 12V
Figure 11. Buck - Output Voltage vs. Output Current; VIN = 12V
100
7
95
6.5
85
80
75
70
65
6
5.5
5
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Output Voltage (V)
Efficiency (%)
90
4.5
4
60
50
3
10
0
100
10
20
30
Figure 12. Buck - Efficiency vs. Output Current; VIN = 24V
95
60
70
80
90
100
Figure 13. Buck - Output Voltage vs. Output Current; VIN = 24V
6.5
Output Voltage (V)
90
Efficiency (%)
50
7
100
85
80
75
70
65
60
6
5.5
5
4.5
4
3.5
55
50
3
10
0
100
10
20
30
Figure 14. Buck - Efficiency vs. Input Voltage
95
60
70
80
90
100
7
6.5
Output Voltage (V)
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90
50
Figure 15. Buck - VOUT vs. Temp.; VIN = 24V
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100
40
Output Current (mA)
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Output Current (mA)
85
80
75
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Efficiency (%)
40
Output Current (mA)
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Output Current (mA)
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3.5
55
70
65
6
5.5
5
4.5
4
60
3.5
55
50
3
12
14
16
18
20
22
24
Input Voltage (V)
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-30 -20 -10
0
10 20 30 40 50 60 70 80 90
Temperature (°C)
Revision 1.04
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AS1390A, AS1390B
Datasheet - O p e r a t i n g C h a r a c t e r i s t i c s
50V/Div
VIN
10V/Div
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VOUT
1ms/Div
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2ms/Div
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5A/Div
EN
1V/Div
50V/Div
5A/Div
IIN
VIN
VOUT
VLOAD
IIN
20V/Div
Figure 17. Start with EN_BOOST pin
20V/Div
Figure 16. Load Regulation
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Revision 1.04
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AS1390A, AS1390B
Datasheet - D e t a i l e d D e s c r i p t i o n
8 Detailed Description
The AS1390 is a high efficiency, high voltage and high current DC-DC Step-up controller combined with an Step-down converter. The device is
designed for LED backlight in LCD TV-sets. The special feature is the optimized operation point for the 2D and 3D mode. Hence the output
voltage of the Step-up Converter can easily be switched via the MODE_3D pin from one voltage to the other.
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Figure 18. Detailed Block Diagram Boost Converter
8.1 Boost Controller
8.1.1
Setting output voltages
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The Output voltages of the AS1390 are defined by a voltage divider between the FB pin and Vout. Due to the capability of the AS1390 to switch
between two output voltages, two dividers are necessary to adjust both output voltages.
Output voltage for 2D-Mode:
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R FB1
V OUT – 2D = V FB ×  1 + -------------------------------
R FB2 + R FB3
(EQ 1)
Output voltage for 3D-Mode:
R FB1 + R FB2
V OUT – 3D = V FB ×  1 + -------------------------------
R FB3
(EQ 2)
Where: VFB = 1.25V
Note: The overall resistance should be in the range of 100k to 200kΩ to avoid any noise issues.
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AS1390A, AS1390B
Datasheet - D e t a i l e d D e s c r i p t i o n
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.
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Figure 19. UVLO - comparator and external resistor divider
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Figure 20. UVLO - comparator Output
Following equations can be derived for adjusting the threshold voltages.
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Undervoltage threshold High:
R UVLO1
V DDH – UVH = V REF ×  1 + -------------------

R UVLO2
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(EQ 3)
Undervoltage threshold High:
(EQ 4)
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R UVLO1
V DDH – UVL = V REF ×  1 + ------------------- – ( IHYST × R UVLO1 )

R UVLO2
Where: IHYST = 20µA
VREF = 1.35V
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AS1390A, AS1390B
Datasheet - D e t a i l e d D e s c r i p t i o n
8.1.3
Continuous Conduction Mode (CCM)
For normal operation the converter should stay in continuous conduction mode, to ensure that the inductor value must be bigger than LCRIT.
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Where:
VIN ... Input voltage at VDDH
VOUT ... Output voltage
VD ... Diode forward voltage at D1
fSW ... Switching frequency
R ... Load resistor, should be calculated with minimum current load R = VOUT / IOUT_min
Duty Cycle
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IOUT_min ... Minimum output current (e.g. for LED dirver only one LED string is on)
8.1.4
(EQ 5)
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L CRIT
V IN
2
 1 – -------------------------- × V IN × R

V OUT + V D
= --------------------------------------------------------------------2
2 × f SW × ( V OUT + V D )
Within CCM, the well known relation between input and output voltage is described in the following equation:
this means for the duty cycle:
8.1.5
Inductor Current
V OUT + V D
1
--------------------------- = ------------V IN
1–D
(EQ 6)
V IN
D = 1 – --------------------------V OUT + V D
(EQ 7)
The inductor current varies during a switching cycle. This variation can be expressed by the mean value of the inductor current and the delta rise/
fall current within each cycle (see Figure 21).
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Figure 21. Inductor Current
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Mean inductor current:
I OUT
I L = ------------1–D
(EQ 8)
D × V IN
∆I L = ------------------fS × L
(EQ 9)
Delta inductor current:
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AS1390A, AS1390B
Datasheet - D e t a i l e d D e s c r i p t i o n
Peak current:
∆I L IOUT
D × VIN
I pk = IL + -------- = ------------- + ----------------------2
1 – D 2 × fS × L
(EQ 10)
RMS inductor current:
2
IL + ( 1 ⁄ 12 × ∆I L )
2
(EQ 11)
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I RMS =
Note: The saturation current of the inductor should be about 20 to 30% larger than the peak current
8.1.6
Input Capacitor
The input capacitor has to supply the delta inductor current and it should be selected according to:
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∆I L
C IN > -----------------------------------4 × ∆V IN × f SW
∆V IN
ESR < ----------------2 × ∆I L
8.1.7
Output Capacitor
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This peak current is flowing through MN1 during phase 1 and through D1 during phase 2 of each cycle. Therefore this peak current is important
for a proper diode D1, MOSFET MN1 and inductor L1 selection.
(EQ 12)
(EQ 13)
The output capacitor must be chosen according to the max allowable output ripple at high load.
I OUT – max × D
C OUT > -----------------------------------∆V OUT × f SW
8.1.8
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∆V OUT
ESR < ----------------------------------------------------IOUT
V IN × D 
 ------------ ------------------------- 1 – D + 2 × L × f SW
(EQ 14)
(EQ 15)
Current Sense Resistor
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V SENSE
R S – max = ----------------------------------I L + 0 , 5 × ∆I L
P RS = I
2
L – rms
(EQ 16)
× RS × D
(EQ 17)
Note: Low inductance and specifically designed current sensing resistors should be used, e.g. Stackpole Electronics CSR/CSRN series of
sensing resistors with less than 0.2nH (typ.).
Compensation Network
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8.1.9
For typical use cases a compensation network should be implemented by C10, C11 and R11 for 2D mode and optional by different component
values C12, C13, R13 for 3D mode (see Figure 18 on page 10).
A typical choice for values of the compensation network is C10 = 100pF, C11 = 10nF, R11 = 100KΩ. Use these values as initial choice and
evaluate the transient response of the system to verify the behavior at output load change. To be able to do a different compensation for 3D
mode, a second pin COMP_3D is available. If no separate compensation for 3D mode is necessary, PINs COMP_2D and COMP_3D can be
connected to one common compensation network.
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AS1390A, AS1390B
Datasheet - D e t a i l e d D e s c r i p t i o n
8.2 Buck Converter
The buck converter of the AS1390 is working with high-efficiency at a constant-frequency. The buck converter is optimized to supply a µC and
with a fixed output voltage of 5V.
The buck converter is working as soon as the AS1390 is powered-up but offers an automatic power save mode. The highly efficient duty cycle
provides low dropout operation, which reduces the power consumption of the system.
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8.3 Overvoltage Protection (OVP)
An overvoltage condition is detected when the feedback voltage is higher than the skip threshold (1.28V typ.). The device is than entering the
skip mode. Meaning the next pulse will be skipped and in the next cycle the overvoltage check is done again.
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8.4 Overcurrent Protection (OCP)
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An overcurrent comparator is monitoring the output current via the sense pin. If an overcurrent condition occurs the transistor will be switched off
immediately. After the overcurrent condition is removed the device is returning to normal operation again.
8.5 Overtemperature Protection (OTP)
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As soon as the junction temperature reaches approximately 140°C the AS1390 goes in thermal shutdown. In this mode the internal transistors
are turned off. The device will power up again, as soon as the temperature falls below +110°C again.
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Revision 1.04
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AS1390A, AS1390B
Datasheet - A p p l i c a t i o n I n f o r m a t i o n
9 Application Information
9.1 Typical Application
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Figure 22. Typical Application
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9.2 Recommended external Components
In order to reach the highest efficiency and best performance of the device we recommend to use the following external components.
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For the capacitors and resistors standard available components can be used. Depending on the desired voltage and the current special
inductors and transistors should be used to guarantee pest performance for high current and high voltage operation. For the transistor we
recommend the SIR432DP from Vishay Siliconix (www.vishay.com) for the Inductors see Table 4.
Table 4. Recommended Inductors
Part Number
L
DCR
74435573300
33µH
22mΩ
8.5A
18.3x18.2x8.9mm
VLCF4020T-470MR39
47µH
849mΩ
0.39A
4.0x4.0x2.0mm
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Current Rating Dimensions (L/W/T)
Revision 1.04
Manufacturer
Würth Elektronik
www.we-online.de
TDK
www.tdk.com
15 - 20
AS1390A, AS1390B
Datasheet - P a c k a g e D r a w i n g s a n d M a r k i n g s
10 Package Drawings and Markings
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Figure 23. 20-Pin QFN (4x4mm) Marking
Figure 24. 16-pin SOIC Marking
Table 5. Packaging Code YYWWMZZ
YY
WW
X
ZZ
manufacturing week
plant identifier
free choice / traceability code
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last two digits of the current year
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Revision 1.04
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AS1390A, AS1390B
Datasheet - P a c k a g e D r a w i n g s a n d M a r k i n g s
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Figure 25. 20-Pin QFN (4x4mm) Package
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Revision 1.04
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AS1390A, AS1390B
Datasheet - P a c k a g e D r a w i n g s a n d M a r k i n g s
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Figure 26. 16-pin SOIC Package
www.austriamicrosystems.com/Power-Management/AS1390
Revision 1.04
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AS1390A, AS1390B
Datasheet - O r d e r i n g I n f o r m a t i o n
11 Ordering Information
The device is available as the standard products listed below.
Table 6. Ordering Information
AS1390A-BQFT
AS1390A
AS1390B-BSOT*
AS1390B
Description
High Power Boost Controller and Buck Converter for LED
Backlight
High Power Boost Controller and Buck Converter for LED
Backlight
Delivery Form
Package
Tape and Reel 20-Pin QFN (4x4mm)
Tape and Reel
*) on request
Note: All products are RoHS compliant and austriamicrosystems green.
Buy our products or get free samples online at ICdirect: http://www.austriamicrosystems.com/ICdirect
16-pin SOIC
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Technical Support is found at http://www.austriamicrosystems.com/Technical-Support
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Marking
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Ordering Code
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For further information and requests, please contact us mailto:[email protected]
or find your local distributor at http://www.austriamicrosystems.com/distributor
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AS1390A, AS1390B
Datasheet
Copyrights
Copyright © 1997-2012, austriamicrosystems AG, Tobelbaderstrasse 30, 8141 Unterpremstaetten, Austria-Europe. Trademarks Registered ®.
All rights reserved. The material herein may not be reproduced, adapted, merged, translated, stored, or used without the prior written consent of
the copyright owner.
All products and companies mentioned are trademarks or registered trademarks of their respective companies.
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Disclaimer
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Devices sold by austriamicrosystems AG are covered by the warranty and patent indemnification provisions appearing in its Term of Sale.
austriamicrosystems AG makes no warranty, express, statutory, implied, or by description regarding the information set forth herein or regarding
the freedom of the described devices from patent infringement. austriamicrosystems AG reserves the right to change specifications and prices at
any time and without notice. Therefore, prior to designing this product into a system, it is necessary to check with austriamicrosystems AG for
current information. This product is intended for use in normal commercial applications. Applications requiring extended temperature range,
unusual environmental requirements, or high reliability applications, such as military, medical life-support or life-sustaining equipment are
specifically not recommended without additional processing by austriamicrosystems AG for each application. For shipments of less than 100
parts the manufacturing flow might show deviations from the standard production flow, such as test flow or test location.
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The information furnished here by austriamicrosystems AG is believed to be correct and accurate. However, austriamicrosystems AG shall not
be liable to recipient or any third party for any damages, including but not limited to personal injury, property damage, loss of profits, loss of use,
interruption of business or indirect, special, incidental or consequential damages, of any kind, in connection with or arising out of the furnishing,
performance or use of the technical data herein. No obligation or liability to recipient or any third party shall arise or flow out of
austriamicrosystems AG rendering of technical or other services.
Contact Information
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Headquarters
austriamicrosystems AG
Tobelbaderstrasse 30
A-8141 Unterpremstaetten, Austria
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Tel: +43 (0) 3136 500 0
Fax: +43 (0) 3136 525 01
For Sales Offices, Distributors and Representatives, please visit:
http://www.austriamicrosystems.com/contact
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