STEVAL-ISA053V1 STMicroelectronics, STEVAL-ISA053V1 Datasheet - Page 41

• Manufacturer Part Number: STEVAL-ISA053V1
• Description: BOARD EVALUATION FOR PM6680
• Manufacturer: STMicroelectronics
• Type: DC/DC Switching Converters, Regulators & Controllersr

Specifications of STEVAL-ISA053V1

• Design Resources: STEVAL-ISA053V1 Gerber Files PM6680 Eval Kit Schematic STEVAL-ISA053V1 Bill of Material
• Main Purpose: DC/DC, Step Down with LDO
• Outputs And Type: 3, Non-Isolated
• Voltage - Output: 1.05V, 1.5V, 5V
• Current - Output: 5A, 5A, 100mA
• Voltage - Input: 6 ~ 28V
• Regulator Topology: Buck
• Frequency - Switching: 200kHz, 300kHz
• Board Type: Fully Populated
• Utilized Ic / Part: PM6680
• Input Voltage: 6 V to 28 V
• Output Voltage: 5 V
• Product: Power Management Modules
• Silicon Manufacturer: ST Micro
• Silicon Core Number: PM6680
• Kit Application Type: Power Management - Voltage Regulator
• Application Sub Type: Step Down DC/DC Controller
• Kit Contents: Board
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Power - Output: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• For Use With/related Products: PM6680
• Other names: 497-6378

PM6680
Figure 39. Inductor current waveforms
Typical components values are: R=47 Ω and C = 1 uF.
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●
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Figure 40. Bootstrap circuit
The bootstrap circuit capacitor value C
side MOSFET during turn on phase. A typical value is 100nF.
The bootstrap diode D must charge the capacitor during the off time phases. The maximum
rated voltage must be higher than V
A resistor R
node rises up, working like a gate resistor for the turn on phase of the high side MOSFET.
VREF capacitor
A 10 nF to 100 nF ceramic capacitor on VREF pin must be added to ensure noise
rejection.
LDO5 output capacitors
Bypass the output of each linear regulator with 1 uF ceramic capacitor closer to the
LDO pin and a 4.7 uF tantalum capacitor (ESR = 2 Ω). In most applicative conditions a
4.7 uF ceramic output capacitor can be enough to ensure stability.
Bootstrap circuit
The external bootstrap circuit is represented in the next figure:
BOOT
on the BOOT pin could be added in order to reduce noise when the phase
L
L
INmax
BOOT
R
R
.
C
C
C
C
R
R
B
B
B
O
B
O
must provide the total gate charge to the high
O
O
O
O
O
O
T
T
D
D
T
T
B
P
B
P
H
O
H
O
L
A
L
A
O
O
L
L
V
V
D
D
S
S
D
D
T
C
C
T
O
O
E
E
O
O
C
C
5
5
5
5
Device description
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