參數(shù)資料
型號(hào)： ISL6421A
廠商： Intersil Corporation
英文描述： Quadruple 2-Input Positive-AND Gates 14-SOIC -40 to 85
中文描述： 單輸出LNB電源和控制穩(wěn)壓器，帶有I2C接口的先進(jìn)衛(wèi)星機(jī)頂盒設(shè)計(jì)
文件頁(yè)數(shù)： 5/12頁(yè)
文件大小： 406K
代理商： ISL6421A
5
FN9167.2
February 11, 2005
LINEAR REGULATOR
Drop-out Voltage
Iout = 450mA (Note 4)
-
1.2
-
V
DSQIN PIN
DSQIN pin logic Low
-
-
1.5V
V
DSQIN pin Logic HIGH
3.5
-
-
V
DSQIN pin Input Current
-
1
-
μ
A
CURRENT SENSE
Input Bias Current
I
BIAS
-
700
-
nA
Overcurrent Threshold
Static current mode, DCL = H
325
400
500
mV
ERROR AMPLIFIER
Open Loop Voltage Gain
A
OL
(Note 4)
70
88
-
dB
Gain Bandwidth Product
GBP
(Note 4)
10
-
-
MHz
PWM
Maximum Duty Cycle
90
93
-
%
Minimum Pulse Width
(Note 4)
-
20
-
ns
OSCILLATOR
Oscillator Frequency
f
o
Fixed at (10)(f
tone
)
200
220
240
kHz
THERMAL PROTECTION
Thermal Shutdown
Temperature Shutdown Threshold
(Note 4)
-
150
-
Temperature Shutdown Hysteresis
(Note 4)
-
20
-
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.
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
Functional Pin Description
SYMBOL
FUNCTION
SDA
Bidirectional data from/to I
2
C bus.
SCL
Clock from I
2
C bus.
VSW
Input of the linear post-regulator.
PGND
Dedicated ground for the output gate driver of the PWM.
CS
Current sense input; connect Rsc at this pin for desired overcurrent value for the PWM.
SGND
Small signal ground for the IC.
AGND
Analog ground for the IC.
TCAP
Capacitor for setting rise and fall time of the output of the LNB. Use a capacitor value of 1μF or higher.
BYPASS
Bypass capacitor for internal 5V.
DSQIN
When HIGH this pin enables the internal 22kHz modulation for the LNB, Use this pin for tone enable function for the
LNB.
ISL6421A
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