ISL6553EVAL1 Intersil, ISL6553EVAL1 Datasheet - Page 12

• Manufacturer Part Number: ISL6553EVAL1
• Description: EVALUATION BOARD ISL6553
• Manufacturer: Intersil
• Series: Endura™r

Specifications of ISL6553EVAL1

• Main Purpose: Special Purpose DC/DC, VRM Supply
• Outputs And Type: 1, Non-Isolated
• Power - Output: 45W
• Voltage - Output: 1.5V
• Current - Output: 30A
• Voltage - Input: 5V, 12V
• Regulator Topology: Buck
• Frequency - Switching: 350kHz
• Board Type: Fully Populated
• Utilized Ic / Part: HIP6601, ISL6553
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

As discussed previously, the voltage drop across each Q2
transistor at the point in time when current is sampled is
r
PHASE node, is applied through the R
ISL6553 ISEN pin. This pin is held at virtual ground, so the
current into ISEN is:
I
R
Example: From the previous conditions,
where I
I
r
Then: R
I
Short circuit I
Channel Frequency Oscillator
The channel oscillator frequency is set by placing a resistor,
R
showing the relationship between frequency, F
resistor R
to place this resistor next to the pin. If this pin is also used to
disable the converter, it is also important to locate the pull-
down device next to this pin.
Layout Considerations
MOSFETs switch very fast and efficiently. The speed with
which the current transitions from one device to another
SENSE
SAMPLE
CURRENT TRIP
DSON
DS(ON)
1,000
Isen
T
500
200
100
, to ground from the FS/DIS pin. Figure 10 is a curve
50
20
10
5
2
1
10
(Q2) x I
LT
ISEN
FIGURE 10. RESISTANCE R
(Q2)
= I
= I
T
20
. To avoid pickup by the FS/DIS pin, it is important
CHANNEL OSCILLATOR FREQUENCY, F
SAMPLE
SAMPLE
LT
SAMPLE
50
= 50A,
= 25.49A,
= 4mΩ
= 2.04K and
= 165%
= 82.5A.
x r
x r
100
DS(ON)
DS(ON)
. The voltage at Q2’s drain, the
200
12
(Q2) / R
(Q2) / 50µA
500 1,000
T
vs FREQUENCY
ISEN
ISEN
2,000
resistor to the
.
SW
SW
(kHz)
5,000 10,000
, and
ISL6553
causes voltage spikes across the interconnecting
impedances and parasitic circuit elements. These voltage
spikes can degrade efficiency, radiate noise into the circuit
and lead to device over-voltage stress. Careful component
layout and printed circuit design minimizes the voltage
spikes in the converter. Consider, as an example, the turnoff
transition of the upper PWM MOSFET. Prior to turnoff, the
upper MOSFET was carrying channel current. During the
turnoff, current stops flowing in the upper MOSFET and is
picked up by the lower MOSFET. Any inductance in the
switched current path generates a large voltage spike during
the switching interval. Careful component selection, tight
layout of the critical components, and short, wide circuit
traces minimize the magnitude of voltage spikes. Contact
Intersil for evaluation board drawings of the component
placement and printed circuit board.
There are two sets of critical components in a DC-DC
converter using a ISL6553 controller and a HIP6601 gate
driver. The power components are the most critical because
they switch large amounts of energy. Next are small signal
components that connect to sensitive nodes or supply critical
bypassing current and signal coupling.
The power components should be placed first. Locate the
input capacitors close to the power switches. Minimize the
length of the connections between the input capacitors, C
and the power switches. Locate the output inductors and
output capacitors between the MOSFETs and the load.
Locate the gate driver close to the MOSFETs.
The critical small components include the bypass capacitors
for VCC and PVCC on the gate driver ICs. Locate the bypass
capacitor, C
device. It is especially important to locate the resistors
associated with the input to the amplifiers close to their
respective pins, since they represent the input to feedback
amplifiers. Resistor R
should also be located next to the associated pin. It is
especially important to place the R
respective terminals of the ISL6553.
A multi-layer printed circuit board is recommended. Figure 11
shows the connections of the critical components for one
output channel of the converter. Note that capacitors C
C
Dedicate one solid layer, usually the middle layer of the PC
board, for a ground plane and make all critical component
ground connections with vias to this layer. Dedicate another
solid layer as a power plane and break this plane into smaller
islands of common voltage levels. Keep the metal runs from
the PHASE terminal to output inductor short. The power plane
should support the input power and output power nodes. Use
copper filled polygons on the top and bottom circuit layers for
the phase nodes. Use the remaining printed circuit layers for
small signal wiring. The wiring traces from the driver IC to the
MOSFET gate and source should be sized to carry at least 1A
of current.
OUT
could each represent numerous physical capacitors.
BP
, for the ISL6553 controller close to the
T
, that sets the oscillator frequency
SEN
resistors at the
IN
and
IN
,