ISL85033-12VEVAL3Z Intersil, ISL85033-12VEVAL3Z Datasheet - Page 2

• Manufacturer Part Number: ISL85033-12VEVAL3Z
• Description: EVAL BAORD FOR ISL85033
• Manufacturer: Intersil
• Series: -r

Specifications of ISL85033-12VEVAL3Z

• Main Purpose: DC/DC, Negative Inverter
• Outputs And Type: 1, Non-Isolated
• Power - Output: -
• Voltage - Output: -3.3 ~ -15 V
• Current - Output: 5A
• Voltage - Input: 4.5 ~ 28 V
• Regulator Topology: Buck
• Frequency - Switching: 300kHz ~ 2MHz
• Board Type: Fully Populated
• Utilized Ic / Part: ISL85033
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

If the output voltage desired is -0.8V, then R3 is shorted. The
value for R2 is typically between 1k and 10k. Note that if
V
compensation must be changed to accommodate the 300kHz
operation, due to minimum on-time limitation. Please refer to
the
Frequency Control
The ISL85033-12VEVAL3Z evaluation board has an FS pin that
controls the frequency of operation. Programmable frequency
allows for optimization between efficiency and external
component size. Default switching frequency is 500kHz when FS
is tied to VCC (R9 = 0). By removing R9 and connecting R10 to
the most negative potential on the board (V
frequency could be changed from 300kHz (R10 = 383k) to 2MHz
(R10 = 40.2k). See the
about calculating the value of R10. Do not leave this pin floating.
OUT
FIGURE 1. ISL85033-12VEVAL3Z BUCK BOOST: RECOMMENDED
ISL85033
FIGURE 3. ISL85033-12VEVAL3Z EFFICIENCY: V
< |2.5V| (i.e., -0.8V), the switching frequency and
95
90
85
80
75
70
65
60
6
5
4
3
2
1
0
0
5
7
MAXIMUM I
data sheet for further information.
0.5
9
ISL85033
11
V
V
OUT
V
IN
IN
OUT
= 12V
= 5V
1.0
13
(V
IN
= -15V
I
2
OUT
V
)
IN
15
data sheet for information
(V)
(A)
V
OUT
1.5
17
= -12V
OUT
19
), the switching
2.0
Application Note 1636
V
V
21
IN
OUT
OUT
= 15V
23
= -5V
= -12V
2.5
25
Disabling/Enabling Function
The ISL85033-12VEVAL3Z evaluation board contains an S1
switch that enables or disables both channels, thus allowing a
low quiescent current state. Table 2 details this function.
NOTE: If driven externally, the EN signal (the same as all input
logic signals) is referenced to V
on the board) and not to GND. Therefore, the source cannot be
GND referenced, and input level shifting is required.
OFF
ON
S1
FIGURE 2. ISL85033-12VEVAL3Z EFFICIENCY: V
FIGURE 4. ISL85033-12VEVAL3Z EFFICIENCY: V
95
90
85
80
75
70
65
60
95
90
85
80
75
70
65
60
Enable V
Disable V
0
0
OUT
OUT
V
0.5
TABLE 2. SWITCH SETTINGS
IN
0.5
= 15V
V
V
ON/OFF CONTROL
IN
IN
1.0
1.0
= 5V
= 6V
OUT
I
I
OUT
OUT
(the most negative potential
(A)
(A)
1.5
1.5
V
IN
= 5V
V
V
2.0
2.0
IN
IN
OUT
OUT
= 12V
= 12V
July 27, 2011
= -15V
= -5V
AN1636.1
2.5
2.5