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产品型号8284的Datasheet PDF文件预览

8284  
ADVANCE INFORMATION  
(Subject to change without notice)  
December 22, 2000  
TWO-OUTPUT LNB SUPPLY AND  
CONTROL-VOLTAGE REGULATOR  
Intended for analog and digital satellite receivers, the low noise block  
converter regulator (LNBR) is a monolithic linear and switching voltage  
regulator designed to provide power and interface signals to the LNB  
downconverter via the coaxial cable. Because most satellite receivers have two  
antenna ports, the output voltage of the regulator is available at one of two  
logic-selectable output terminals (LNBA, LNBB). If the device is in stand-by  
mode (EN terminal LOW), both regulator outputs are disabled, allowing the  
antenna downconverters to be supplied and controlled by other satellite  
receivers sharing the same coaxial cable. Similar single-output devices, with a  
bypass function for slave operation in single-dish dual-receiver systems, are the  
A8283SB/SLB.  
A8284SLB  
OSEL  
OLF  
1
2
3
4
24 EXTM  
23 VINT  
VBULK  
PUMPX  
22  
LNBB  
NC  
21 VPUMP  
CPUMP  
GND  
5
6
7
8
20  
19  
The regulator outputs are set to 12, 13, 18, or 20 V by the VSEL terminals.  
Additionally, it is possible to increase the selected voltage by 1 V to compen-  
sate for the voltage drop in the coaxial cable (LLC terminal HIGH).  
GND  
GND  
18 GND  
ENT  
The LNBR combines a tracking switching regulator and low-noise linear  
regulators. Logic inputs (VSEL0, VSEL1, and LLC) select the desired output  
voltage. A tracking current-mode buck converter provides the linear regulator  
input voltage that is set to the output voltage plus typically 0.8 V. This  
maintains constant voltage drop across the linear regulators while permitting  
adequate voltage range for tone injection.  
SENSE  
17  
LNBA 9
LX 10  
16 EN  
BUCK  
15 VSEL0  
11  
12  
REG.  
VSEL1  
LLC  
VIN  
14  
13  
The device is supplied in a 24-pin plastic DIP with batwing tabs  
(A8284SB), or a 24-lead SOIC power-tab package (A8284SLB). In both cases,  
the power tab is at ground potential and needs no electrical isolation.  
TCAP  
FEATURES  
Dwg. PP-072-1A  
I
I
I
Complete Interface for Two LNBs Remote Supply and Control  
LNB Selection and Stand-By Function  
Built-In Tone Oscillator Factory Trimmed to 22 kHz, Facilitates  
DiSEqC™ (a trademark of EUTELSAT) Encoding  
Full Modulation With No Load  
Tracking Switch-Mode Power Converter for Lowest Dissipation  
Externally Adjustable Short-Circuit Protection  
LNB Short-Circuit Protection and Diagnostics  
Auxiliary Modulation Input  
Note that the A8284SB (dual in-line package)  
and A8284SLB (small-outline IC package) are  
electrically identical and share a common  
terminal number assignment.  
I
I
I
I
I
I
I
ABSOLUTE MAXIMUM RATINGS  
Supply Voltage, VIN .......................... 47 V  
Output Current, IO .... Internally Limited  
Logic Input Voltage Range,  
Cable Length Compensation  
Internal Over-Temperature Protection  
VI ................................... -0.5 V to +7 V  
Flag Output Voltage, VOLF .................. 7 V  
Operating Temperature Range,  
This device incorporates features that have patents pending.  
TA ............................... -20°C to +85°C  
Storage Temperature Range,  
TS ............................. -40°C to +150°C  
Always order by complete part number, e.g., A8284SLB .  
8284  
TWO-OUTPUT LNB SUPPLY AND  
CONTROL-VOLTAGE REGULATOR  
FUNCTIONAL BLOCK DIAGRAM  
RS  
47 V  
MAX  
+
BOOST VOLTAGE  
VINT  
EN  
CHARGE  
PUMP  
VOLTAGE  
REG.  
+
BUCK  
CONV.  
OVER-  
CURRENT  
+
+
7 V  
150 mV  
5 V  
VREF  
176 kHz  
LNBB  
352 kHz  
800 mV  
÷2  
+
25 kΩ  
1
0
+
ENT  
5 kΩ  
5 kΩ  
22 kHz TONE  
÷8  
&
EXTM  
LNBA  
WAVESHAPING  
TSD  
1 kΩ  
OLF  
OVER-CURRENT  
TCAP  
Dwg. FP-051  
OSEL VSEL0 VSEL1  
LLC VLNBA(typ) VLNBB(typ)  
L
L
L
L
13 V  
Low  
L
L
L
L
L
L
L
L
H
H
H
H
L
L
L
L
H
H
H
H
L
H
H
L
H
L
H
L
H
L
H
L
H
L
H
L
H
L
H
14 V  
18 V  
19 V  
12 V  
13 V  
20 V  
21 V  
Low  
Low  
Low  
Low  
Low  
Low  
Low  
Low  
Low  
Low  
Low  
Low  
Low  
Low  
Low  
13 V  
14 V  
18 V  
19 V  
12 V  
13 V  
20 V  
21 V  
L
L
L
H
H
L
Output Voltage Select Table  
H
H
H
H
H
H
H
H
L
H
H
L
L
H
H
115 Northeast Cutoff, Box 15036  
Worcester, Massachusetts 01615-0036 (508) 853-5000  
Copyright © 2000, Allegro MicroSystems, Inc.  
2
8284  
TWO-OUTPUT LNB SUPPLY AND  
CONTROL-VOLTAGE REGULATOR  
ELECTRICAL CHARACTERISTICS at TA = 25°C, OSEL = H for LNBB, OSEL = L for LNBA (each  
output tested separately), ENT = L, EN = H, LLC = L, VIN = 24 V, IO = 50 mA (unless otherwise  
noted).  
Limits  
Characteristic  
Supply Voltage  
Output Voltage  
Symbol  
VIN  
Test Conditions  
Min.  
Typ. Max. Units  
IO = 600 mA, VSEL0 = L, VSEL1 = L, LLC = L  
IO = 600 mA, VSEL0 = L, VSEL1 = L, LLC = L  
IO = 600 mA, VSEL0 = L, VSEL1 = L, LLC = H  
IO = 600 mA, VSEL0 = L, VSEL1 = H, LLC = L  
IO = 600 mA, VSEL0 = L, VSEL1 = H, LLC = H  
IO = 600 mA, VSEL0 = H, VSEL1 = L, LLC = L  
IO = 600 mA, VSEL0 = H, VSEL1 = L, LLC = H  
IO = 600 mA, VSEL0 = H, VSEL1 = H, LLC = L  
IO = 600 mA, VSEL0 = H, VSEL1 = H, LLC = H  
VO = 13 V, VI = 16 to 40 V  
3.3 + VBUCK 47  
V
V
VO  
12.5  
13.4  
17.3  
18.2  
11.5  
12.5  
19.2  
20.2  
13  
14  
13.5  
14.6  
18.7  
19.8  
12.5  
13.5  
20.8  
21.8  
40  
V
18  
V
19  
V
12  
V
13  
V
20  
V
21  
V
Line Regulation  
Load Regulation  
VO  
VO  
4.0  
4.0  
80  
mV  
mV  
mV  
mV  
kHz  
mV  
%
VO = 18 V, VI = 21 to 40 V  
40  
VO = 13 or 18 V, IO = 50 to 600 mA  
180  
145  
24  
Current-Limiting Threshold VOM(th)  
125  
20  
135  
22  
Tone Frequency  
ftone  
Vtone(PP)  
dctone  
tr, tf  
ENT = H  
Tone Amplitude  
ENT = H  
550  
40  
680  
50  
800  
60  
Tone Duty Cycle  
ENT = H  
Tone Rise or Fall Time  
External Modulation Gain  
ENT = H  
5.0  
10  
15  
µs  
V/V  
mV  
Gmod  
VO/Vmod, f = 10 Hz to 40 kHz  
AC coupling  
5.0  
External Modulation  
Input Voltage  
Vmod(PP)  
160  
External Modulation  
Impedance  
Zmod  
f = 10 Hz to 40 kHz  
5.0  
kΩ  
continued next page ...  
www.allegromicro.com  
3
8284  
TWO-OUTPUT LNB SUPPLY AND  
CONTROL-VOLTAGE REGULATOR  
ELECTRICAL CHARACTERISTICS at TA = 25°C, ENT = L, EN = H, LLC = L, VIN = 24 V, IOUT = 50 mA  
(unless otherwise noted).  
Limits  
Characteristic  
Symbol  
VOL  
Test Conditions  
IOL = 8 mA  
Min.  
Typ. Max. Units  
Overload Flag Logic Low  
0.28  
<1.0  
V
Overload Flag  
IOZ  
VOH = 5.5 V  
µA  
Leakage Current  
Logic Input Voltage  
VIL  
VIH  
IIH  
2.0  
0.8  
V
V
Logic Input Current  
Supply Current  
VIH = 5 V  
<1.0  
0.5  
382  
µA  
mA  
mA  
IIN  
Outputs disabled (EN = L)  
ENT = H, IO = 600 mA, VO = 13 V  
Thermal Shutdown Temp.  
Linear Regulator Voltage Drop  
Switching Frequency  
TJ  
VBUCK  
fO  
165  
0.8  
°C  
V
VBULK – VO  
16 • ftone  
320  
352  
384  
kHz  
115 Northeast Cutoff, Box 15036  
Worcester, Massachusetts 01615-0036 (508) 853-5000  
4
8284  
TWO-OUTPUT LNB SUPPLY AND  
CONTROL-VOLTAGE REGULATOR  
FUNCTIONAL DESCRIPTION  
The ENT (Tone Enable) terminal activates the internal  
tone signal, modulating the dc output with a 0.3 V, 22  
kHz symmetrical waveform. The internal oscillator is  
factory trimmed to provide a tone of 22 kHz 2 kHz. No  
further adjustment is required. The internal oscillator  
operates the buck converter at 16 times the tone fre-  
quency.  
In operation, the short-circuit protection produces  
current fold-back at the input due to the tracking con-  
verter. If the output is shorted the linear regulator will  
limit the output current to IOM. The tracking converter  
will maintain a constant voltage drop of 0.8 V across the  
linear regulator. This condition results in typically 550  
mW dissipation (IOM • 0.8 V). Short-circuit or thermal  
shutdown activation will cause the OLF terminal, an open-  
drain diagnostic output flag, to go LOW.  
Burst coding of the 22 kHz tone can be accomplished,  
due to the fast response of the ENT input and rapid tone  
response. This allows implementation of the DiSEqC™  
protocols.  
Thermal resistance:  
DIP — RθJA = 40°C/W, RθJT = 6°C/W,  
SOIC — RθJA = 55°C/W, RθJT = 6°C/W.  
The device junction temperature should be kept below  
150°C. Thermal shut-down circuitry turns off the device  
if junction temperature exceeds +165°C typically.  
To improve design flexibility and to allow implemen-  
tation of proposed LNB remote control standards, an  
analog modulation input terminal is available (EXTM).  
An appropriate dc blocking capacitor must be used to  
couple the modulating signal source to the EXTM termi-  
nal. If external modulation is not used, the EXTM termi-  
nal can be left open.  
The output linear regulators will sink and source  
current. This feature allows full modulation capability  
into capacitive loads as high as 0.25 µF.  
The programmed output voltage rise and fall times  
can be set by an internal 25 kresistor and an external  
capacitor located on the TCAP terminal. Although any  
value of capacitor is permitted, practical values are  
typically 0.001 µF to 0.02 µF. This feature only affects  
the turn on and programmed voltage rise and fall times.  
Modulation is unaffected by the choice of TCAP. This  
terminal can be left open if voltage rise and fall time  
control is not required.  
The products described here are manufactured under one or more  
U.S. patents or U.S. patents pending.  
Allegro MicroSystems, Inc. reserves the right to make, from time to  
time, such departures from the detail specifications as may be  
required to permit improvements in the performance, reliability, or  
manufacturability of its products. Before placing an order, the user is  
cautioned to verify that the information being relied upon is current.  
Two terminals are dedicated to the over-current  
protection/monitoring: SENSE and OLF. The LNB output  
is current limited. The short-circuit protection threshold is  
set by the value of an external resistor, RS, between  
terminals 3 and 8. RS = VOM(th)/IOM where VOM(th) is the  
current-limiting threshold voltage and IOM is the desired  
current limit value. The minimum recommended value  
for RS is 0.17 .  
Allegro products are not authorized for use as critical components  
in life-support devices or systems without express written approval.  
The information included herein is believed to be accurate and  
reliable. However, Allegro MicroSystems, Inc. assumes no responsi-  
bility for its use; nor for any infringement of patents or other rights of  
third parties which may result from its use.  
www.allegromicro.com  
5
8284  
TWO-OUTPUT LNB SUPPLY AND  
CONTROL-VOLTAGE REGULATOR  
Terminal Configuration  
Function  
Symbol  
Terminal  
OSEL  
1
Logic input: selects between LNBA (when low) and  
LNBB (when high)  
OLF  
2
Overload flag output: low when IO > IOM or TJ > 165°C,  
high when IO < IOM and TJ < 130°C  
VBULK  
LNBB  
NC  
3
4
Tracking supply voltage to linear regulators  
Output voltage to LNBB  
5
No (internal) connection  
GND  
SENSE  
LNBA  
LX  
6, 7  
8
Ground  
Current limit setup resistor  
9
Output voltage to LNBA  
10  
11  
12  
13  
Inductor drive point  
VIN  
Supply input voltage (minimum, VLNB + 2.5 V)  
Capacitor for setting the rise and fall time of the outputs  
TCAP  
LLC  
Logic input: when high, increases output voltage by 1 V  
for line length compensation  
VSEL1  
VSEL0  
EN  
14  
15  
16  
17  
Logic input: output voltage select  
Logic input: output voltage select  
Logic input: when high, enables device (LNB on)  
ENT  
Logic input: when high, enables internal 22 kHz  
modulation  
GND  
18, 19  
20  
Ground  
CPUMP  
VPUMP  
PUMPX  
VINT  
High side of charge-pump capacitor  
Gate supply voltage for high-side drivers  
Charge-pump drive  
21  
22  
23  
Bypass capacitor for internal voltage reference  
External modulation input  
EXTM  
24  
115 Northeast Cutoff, Box 15036  
Worcester, Massachusetts 01615-0036 (508) 853-5000  
6
8284  
TWO-OUTPUT LNB SUPPLY AND  
CONTROL-VOLTAGE REGULATOR  
A8284SB  
Dimensions in Inches  
(controlling dimensions)  
0.014  
0.008  
NOTE 1  
24  
13  
0.430  
MAX  
0.280  
0.240  
0.300  
BSC  
1
6
7
12  
0.100  
BSC  
0.070  
0.045  
0.005  
MIN  
1.280  
1.230  
0.210  
MAX  
0.015  
MIN  
0.150  
0.115  
0.022  
0.014  
Dwg. MA-001-25A in  
Dimensions in Millimeters  
(for reference only)  
0.355  
0.204  
NOTE 1  
24  
13  
10.92  
MAX  
7.11  
6.10  
7.62  
BSC  
1
6
7
12  
2.54  
BSC  
1.77  
1.15  
0.13  
MIN  
32.51  
31.24  
5.33  
MAX  
0.39  
MIN  
3.81  
2.93  
0.558  
0.356  
Dwg. MA-001-25A mm  
NOTES: 1. Webbed lead frame. Leads 6, 7, 18, and 19 are internally one piece.  
2. Exact body and lead configuration at vendor’s option within limits shown.  
3. Lead spacing tolerance is non-cumulative  
4. Lead thickness is measured at seating plane or below.  
www.allegromicro.com  
7
8284  
TWO-OUTPUT LNB SUPPLY AND  
CONTROL-VOLTAGE REGULATOR  
A8284SLB  
Dimensions in Inches  
(for reference only)  
13  
24  
0.0125  
0.0091  
0.491  
0.394  
0.2992  
0.2914  
0.050  
0.016  
1
2
3
0.020  
0.013  
0.050  
0.6141  
0.5985  
0° TO 8  
BSC  
NOTE 1  
NOTE 3  
0.0926  
0.1043  
Dwg. MA-008-25 in  
0.0040MIN  
.
Dimensions in Millimeters  
(controlling dimensions)  
24  
13  
0.32  
0.23  
10.65  
10.00  
7.60  
7.40  
1.27  
0.40  
1
2
3
0.51  
0.33  
1.27  
15.60  
15.20  
0° TO 8  
BSC  
NOTE 1  
NOTE 3  
2.65  
2.35  
Dwg. MA-008-25A mm  
0.10 MIN  
.
NOTES: 1. Exact body and lead configuration at vendor’s option within limits shown.  
2. Lead spacing tolerance is non-cumulative  
3. Webbed lead frame. Leads 6, 7, 18, and 19 are internally one piece.  
115 Northeast Cutoff, Box 15036  
Worcester, Massachusetts 01615-0036 (508) 853-5000  
8
配单直通车
828404-1产品参数
型号:828404-1
是否无铅: 不含铅
是否Rohs认证: 符合
生命周期:Obsolete
Reach Compliance Code:unknown
风险等级:5.84
主体/外壳类型:RECEPTACLE
连接器类型:RECTANGULAR CONNECTOR
联系完成配合:GOLD (50) OVER NICKEL
联系完成终止:GOLD (50) OVER NICKEL
触点材料:COPPER TIN ALLOY
DIN 符合性:NO
IEC 符合性:NO
JESD-609代码:e4
MIL 符合性:NO
制造商序列号:828404-1
选件:GENERAL PURPOSE
Base Number Matches:1
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