ISL6617CRZ Intersil, ISL6617CRZ Datasheet - Page 9

• Manufacturer Part Number: ISL6617CRZ
• Description: Phase Splitter, Commercial, 10LD 3X3 DFN
• Manufacturer: Intersil

C. VARIOUS OPERATIONAL MODES
The ISL6617 has three distinct operating modes
depending upon the voltage level of the EN_PH_SYNC
pin. To ensure that the ISL6617 is in operation, the pin
must be above 2V. When the EN_PH_SYNC pin is set to
above 97% of V
interleaving mode with a maximum extension of 70ns.
When V
operates in interleaving mode with a fixed extension of
120ns and a variable extension of up to 70ns. This
results in a minimum extension of 120ns and a max of
190ns. To enter this 2nd interleaving mode, the pin must
remain in the 78% to 85% range for at least 4 cycles.
Between 54% and 64% of V
synchronous mode. Figures 4 and 5 show simplified
synchronous and interleaving modes’ operational
waveforms, respectively.
Interleaving#1 97%*VCC
Interleaving#2 78%*VCC 81%*VCC 85%*VCC 120ns + (0ns
Synchronous
Enable High
Enable Low
Not Used
MODE
FIGURE 6. CONFIGURATION FOR TRANSITION BETWEEN SYNCHRONOUS AND INTERLEAVING #1 MODES
CC
TABLE 1. ISL6617 OPERATIONAL MODES
is between 78% and 85% of V
54%*VCC 60%*VCC 64%*VCC
CC
MIN
SYNC
2V
, the ISL6617 will operate in
60%*R
40%*R
From 0.8V to 2V or 54% of VCC is not
recommended Region.
9
TYP
CC
, the device operates in
VCC
EN_PH_ SYNC
MAX
0.8V
VCC
CC
, the ISL6617
EXTENSION
TTL
0ns to 70ns
0ns to 70ns
to 70ns)
ISL6617
ISL6617
ISL6617
+
-
+
-
+
+
-
-
To transition between two different modes, the
EN_PH_SYNC pin voltage level needs to be set
accordingly. Figures 6 and 7 show an example of external
circuits for mode transition between synchronous mode
and interleaving #1 or #2 mode, respectively. The R
should be less than 50kΩ to improve transition time.
FIGURE 4. INTERLEAVING MODE’S OPERATIONAL
FIGURE 5. SYNCHRONOUS MODE’S OPERATIONAL
PWMA
PWMB
PWMA
PWMB
PWM
PWM
0ns TO 70ns
SYNC
EN_PH
WAVEFORMS (ENx = VCC, OR 81%*VCC)
INTERLEAVING
WAVEFORMS (EN_PH_SYNC = 60%*VCC)
0ns TO 70ns
BLANKING
4 CYCLES
+120+(0ns TO 70ns)
INTERLEAVING
February 4, 2010
FN7564.0