ISL6423B_14 Datasheet, PDF (7/16 Pages) Intersil Corporation – Single Output LNB Supply and Control Voltage Regulator with I2C Interface for Advanced Satellite Set-Top Box Designs

Electrical Specifications
V_CC =
VBOT
12V, T_A = -20°C to
= L, ENT = L, DCL
=+8L5,°IC_O^,_U^u_T^{n=le1ss2motAh,eurwnliesessnoottheedr.wTiyspeicnaoltevadl.uSeeseasreofatwt} aT^Are=de+s2c5r°iCpt.ioEnNs=ecHtio, nVTfoOrPI²C
access to the system. (Continued)
PARAMETER
SYMBOL
TEST CONDITIONS
MIN
TYP
MAX
UNITS
OSCILLATOR
Oscillator Frequency
Thermal Shutdown
f_o
Fixed at (20)(f_tone)
396
440
484
kHz
Temperature Shutdown Threshold
-
150
-
°C
Temperature Shutdown Hysteresis
-
20
-
°C
OTFI
FLT (released)
V_O = 6V
-
-
10
μA
FLT (asserted)
I_SINK = 3.2mA
-
-
0.4
V
NOTES:
5. Internal digital soft-start
6. EXTM, TXT and SELVTOP and addr 0/1 pins have 200k internal pulldown resistors.
7. On exceeding this backward current limit threshold for a period of 2ms, the device enters the Backward dynamic current limit mode (350mA typ)
and the BCF I²C bit is set. The dynamic current limit duty ratio during a back current fault is ON = 2ms/OFF = 50ms. The output will remain
clamped to the fault output voltage till released. On removal of the fault condition the device returns to normal operation
8. In the Dynamic current limit mode the output is ON for 51ms and OFF for 900ms. But remains continuously ON in the Static mode. When tone
is ON the minimum current limit is 50mA lower the values indicated in the table.
Tone Waveform
ENT
I²C
MSEL
I²C
EXTM
PIN
VOUT
PIN
22kHz
22kHz
INTERNAL TONE
Tr = 10µs TYP
22kHz
22kHz
22kHz
22kHz
EXTERNAL TONE
Tr = 10µs TYP
INTERNAL TONE
RETURNS TO NOMINAL V_OUT ~1 PERIOD
AFTER THE LAST EXTM RISING EDGE
T > 55µs;
NOTES:
9. The signal pin TXT changes the decoder threshold during tone transmit and receive. TTH allows threshold control through I²C.
10. The tone rise and fall times are not shown due to resolution of graphics. It is 10µs typ for 22kHz.
11. The EXTM pins have input thresholds of Vil(max) = 0.8V and Vih(min) = 1.7V
FIGURE 1. TONE WAVEFORM
7
FN6412.1
April 10, 2007