参数资料
| 型号： | ISL6421AERZ-T |
| 厂商： | Intersil |
| 文件页数： | 5/12页 |
| 文件大小： | 0K |
| 描述： | IC REG SGL LNB CONTROL 32-QFN |
| 标准包装： | 6,000 |
| 应用： | 转换器，卫星信号接收机顶盒设计 |
| 输入电压： | 8 V ~ 14 V |
| 输出数： | 1 |
| 输出电压： | 13 V ~ 18 V |
| 工作温度： | -20°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 32-VFQFN 裸露焊盘 |
| 供应商设备封装： | 32-QFN（5x5） |
| 包装： | 带卷 (TR) |
ISL6421A
Electrical Specifications
VCC = 12V, T A = -20°C to +85°C, unless otherwise noted. Typical values are at T A = 25°C. EN = H, LLC = L,
ENT = L, DCL = L, DSQIN = L, Iout = 12mA, unless otherwise noted. See software description section for I 2 C
access to the system. (Continued)
PARAMETER
SYMBOL
TEST CONDITIONS
MIN
TYP
MAX
UNITS
LINEAR REGULATOR
Drop-out Voltage
Iout = 450mA (Note 5)
-
1.2
-
V
DSQIN PIN
DSQIN pin logic Low
DSQIN pin Logic HIGH
DSQIN pin Input Current
-
3.5
-
-
-
1
1.5V
-
-
V
V
μ A
CURRENT SENSE
Input Bias Current
Overcurrent Threshold
I BIAS
Static current mode, DCL = H
-
325
700
400
-
500
nA
mV
ERROR AMPLIFIER
Open Loop Voltage Gain
Gain Bandwidth Product
A OL
GBP
(Note 5)
(Note 5)
70
10
88
-
-
-
dB
MHz
PWM
Maximum Duty Cycle
90
93
-
%
Minimum Pulse Width
(Note 5)
-
20
-
ns
OSCILLATOR
Oscillator Frequency
f o
Fixed at (10)(f tone )
200
220
240
kHz
THERMAL PROTECTION
Thermal Shutdown
Temperature Shutdown Threshold
Temperature Shutdown Hysteresis
(Note 5)
(Note 5)
-
-
150
20
-
-
°C
°C
NOTES:
3. Internal digital soft-start.
4. Voltage programming signals VSEL and LLC are implemented via the I 2 C bus.
IO1 = IO2 = 500mA.
5. Guaranteed by design.
Functional Pin Description
SYMBOL
SDA
SCL
VSW
PGND
CS
SGND
AGND
TCAP
BYPASS
DSQIN
FUNCTION
Bidirectional data from/to I 2 C bus.
Clock from I 2 C bus.
Input of the linear post-regulator.
Dedicated ground for the output gate driver of the PWM.
Current sense input; connect Rsc at this pin for desired overcurrent value for the PWM.
Small signal ground for the IC.
Analog ground for the IC.
Capacitor for setting rise and fall time of the output of the LNB. Use a capacitor value of 1μF or higher.
Bypass capacitor for internal 5V.
When HIGH this pin enables the internal 22kHz modulation for the LNB, Use this pin for tone enable function for the
LNB.
5
FN9167.3
March 9, 2006
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