ZL6100EVAL1Z Intersil, ZL6100EVAL1Z Datasheet - Page 16

• Manufacturer Part Number: ZL6100EVAL1Z
• Description: EVAL BOARD USB ZL6100
• Manufacturer: Intersil

Specifications of ZL6100EVAL1Z

• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

The switching frequency can also be set to any value
between 200kHz and 1.33MHz using the I
interface. The available frequencies below 1.4MHz are
defined by f
6
≤ N ≤
R
(kΩ)
12.1
13.3
14.7
16.2
17.8
19.6
21.5
23.7
SYNC
10
11
TABLE 11. SWITCHING FREQUENCY SELECTION
40. See Application Note AN2033 for details.
SYNC PIN
SW
TABLE 12. R
Resistor
OPEN
HIGH
LOW
= 8MHz/N, where the whole number N is
(kHz)
f
200
222
242
267
296
320
364
400
421
471
SW
SYNC
16
RESISTOR VALUES
200kHz – 1.33MHz
R
SYNC
(kΩ)
26.1
28.7
31.6
34.8
38.3
46.4
51.1
56.2
68.1
SYNC
−
ZL6100
FREQUENCY
N/C
See Table 12
A) SYNC = OUTPUT
2
C/SMBus
200k
400k
(Hz)
FIGURE 13. SYNC PIN CONFIGURATIONS
1M
SYNC
ZL6100
LOGIC
HIGH
(kHz)
1000
1143
1333
f
533
571
615
727
800
889
SW
-
OR
Open
C) SYNC = AUTO DETECT
LOGIC
LOGIC
HIGH
ZL6100
LOW
SYNC
200kHz – 1.4MHz
ZL6100
If a value other than f
PMBus command, the internal circuitry will select the valid
switching frequency value that is closest to the entered
value. For example, if 810kHz is entered, the device will
select 800kHz (N = 10).
When multiple Zilker Labs devices are used together,
connecting the SYNC pins together will force all devices to
synchronize with each other. The CFG pin of one device
must set its SYNC pin as an output and the remaining
devices must have their SYNC pins set as Auto Detect.
Note: The switching frequency read back using the
appropriate PMBus command will differ slightly from the
selected values in Table 12. The difference is due to
hardware quantization.
Power Train Component Selection
The ZL6100 is a synchronous buck converter that uses
external MOSFETs, inductor and capacitors to perform the
power conversion process. The proper selection of the
external components is critical for optimized performance.
To select the appropriate external components for the
desired performance goals, the power supply requirements
listed in Table 13 must be known.
N/C
B) SYNC = INPUT
SYNC
OR
ZL6100
R
SYNC
SW
= 8MHz/N is entered using a
SYNC
ZL6100
N/C
December 15, 2010
FN6876.2