isl6423 Intersil Corporation, isl6423 Datasheet - Page 7

• Manufacturer Part Number: isl6423
• Description: Single Output Lnb Supply And Control Voltage Regulator With I2c Interface For Advanced Satellite Set-top Box Designs, Diseqc 2.0 Compatible
• Manufacturer: Intersil Corporation

Electrical Specifications
NOTES:
Tone Waveform
NOTES:
10. The tone rise and fall times are not shown due to resolution of graphics. It is 10µs typical for 22kHz.
11. The EXTM pins have input thresholds of Vil(max) = 0.8V and Vih(min) = 1.7V
THERMAL SHUTDOWN
Temperature Shutdown Threshold
Temperature Shutdown Hysteresis
FLT
FLT (released)
FLT (asserted)
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 100µs, the device enters the dynamic current limit mode and the BCF I
8. In the Dynamic current limit mode the output is ON for 20ms and OFF for 900ms, but remains continuously ON in the Static mode. When tone
9. The signal pin TXT changes the decoder threshold during tone transmit and receive. TTH allows threshold control through I
MSEL
EXTM
VOUT
ENT
is set. The dynamic current limit duty ratio during a back current fault is ON = 100µs/OFF = 5ms.
is ON, the minimum current limit is 50mA lower than the values indicated in the table. While in the dynamic mode of current limit the overload
trip level is momentarily increased to 990mA during the 20ms ON time to facilitate recovery from overload conditions.
I
I
PIN
PIN
2
2
C
C
PARAMETER
Internal Tone
Tr = 10µs typ
22kHz
22kHz
7
V
VBOT = L, ENT = L, DCL = L, Iout = 12mA, unless otherwise noted. See software description section for I
access to the system. (Continued)
CC
= 12V, T
SYMBOL
A
External Tone
Tr = 10µs typ
= -20°C to +85°C, unless otherwise noted. Typical values are at T
22kHz
V
I
SINK
FIGURE 1. TONE WAVEFORM
O
= 6V
= 3.2mA
ISL6423
TEST CONDITIONS
22kHz
Returns to nominal V
after the last EXTM rising edge
T > 55µs;
22kHz
OUT
~1 period
22kHz
MIN
-
-
-
-
TYP
150
A
20
-
-
Internal Tone
= +25°C. EN = H, VTOP
MAX
0.4
10
2
-
-
C.
April 10, 2007
UNITS
FN9191.1
°C
°C
μA
V
2
C bit
2
C