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| 型号： | A8293SETTR-T |
| 厂商： | Allegro Microsystems Inc |
| 文件页数： | 4/19页 |
| 文件大小： | 0K |
| 描述： | IC REG LNB BOOST/LINEAR 28QFN |
| 标准包装： | 9,000 |
| 应用： | 转换器，模拟和数字式卫星信号 STB 接收器/SatTV |
| 输入电压： | 9 V ~ 16 V |
| 输出数： | 1 |
| 输出电压： | 可调 |
| 工作温度： | -20°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 28-VFQFN |
| 供应商设备封装： | 28-QFN |
| 包装： | 带卷 (TR) |
A8293
Single LNB Supply and Control Voltage Regulator
ELECTRICAL CHARACTERISTICS at T A = 25°C, V IN = 9 to 16 V, unless noted otherwise 1
Characteristics
Symbol
Test Conditions
Min.
Typ.
Max.
Units
General
Set-Point Accuracy, Load and Line Regulation
Supply Current
Err
I IN(Off)
I IN(On)
Relative to selected V LNB target level,
I LOAD = 0 to 450 mA
ENB bit = 0, LNB output disabled, V IN = 12 V
ENB bit = 1, LNB output enabled,
I LOAD = 0 mA, V IN = 12 V
–3.0
–
–
–
–
–
+3.0
10.0
19.0
%
mA
mA
Boost Switch On Resistance
Switching Frequency
R DS(on)BOOST I LOAD = 450 mA
f SW
–
320
300
352
–
384
m Ω
kHz
Switch Current Limit
Linear Regulator Voltage Drop
TCAP Pin Current
Output Voltage Rise Time 2
Output Voltage Pull-Down Time 2
Output Reverse Current
I LIMSW
? V REG
I CHG
I DISCHG
t r(VLNB)
t f(VLNB)
I RLNB
V IN = 9 V, V OUT = 19.0 V
V BOOST – V LNB , no tone signal,
I LOAD = 450 mA
TCAP capacitor (C7) charging
TCAP capacitor (C7) discharging
For V LNB 13 → 18 V; C TCAP = 5.6 nF,
I LOAD = 450 mA
For V LNB 18 → 13 V; C LOAD = 100 μ F,
I LOAD = 0 mA
ENB bit = 0, V LNB = 33 V , BOOST capacitor
(C5) fully charged
–
–
–12.5
7.5
–
–
–
2.7
800
–10
10
500
12.5
1
–
–
–7.5
12.5
–
–
5
A
mV
μ A
μ A
μ s
ms
mA
20 MHz BWL; reference circuit shown in
Ripple and Noise on LNB
Output 3
V rip,n(pp)
Functional Block diagram; contact Allegro for
additional information on application circuit
–
30
–
mV PP
board design
Protection Circuitry
Output Overcurrent Limit 4
Overcurrent Disable Time
VIN Undervoltage Lockout Threshold
VIN Turn On Threshold
Undervoltage Hysteresis
Thermal Shutdown Threshold 2
Thermal Shutdown Hysteresis 2
Power Not Good Flag Set
I LIMLNB
t DIS
V UVLO
V IN(th)
V UVLOHYS
T J
? T J
PNG SET
V BOOST – V LNB = 800 mV
V IN falling
V IN rising
With respect to V LNB
–
–
7.05
7.40
–
–
–
77
700
48
7.35
7.70
350
165
20
85
800
–
7.65
8.00
–
–
–
93
mA
ms
V
V
mV
°C
°C
%
Power Not Good Flag Reset
PNG RESET With respect to V LNB
82
90
98
%
Power Not Good Hysteresis
PNG HYS
With respect to V LNB
–
5
–
%
Tone
Tone Frequency
f TONE
20
22
24
kHz
Tone Amplitude, Peak-to-Peak
V TONE(pp)
I LOAD = 0 to 450 mA, C LOAD = 750 nF
400
620
800
mV
Continued on the next page…
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
4
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