參數(shù)資料
型號(hào): ISL6522BCBZ
廠商: INTERSIL CORP
元件分類: 穩(wěn)壓器
英文描述: Buck and Synchronous Rectifier Pulse-Width Modulator (PWM) Controller
中文描述: SWITCHING CONTROLLER, 230 kHz SWITCHING FREQ-MAX, PDSO14
封裝: GREEN, PLASTIC, MS-012AB, SOIC-14
文件頁(yè)數(shù): 12/15頁(yè)
文件大?。?/td> 454K
代理商: ISL6522BCBZ
12
Figure 10 shows the upper gate drive supplied by a direct
connection to V
CC
. This option should only be used in
converter systems where the main input voltage is +5V
DC
or
less. The peak upper gate-to-source voltage is
approximately V
CC
less the input supply. For +5V main
power and +12V
DC
for the bias, the gate-to-source voltage
of Q1 is 7V. A logic-level MOSFET is a good choice for Q1
and a logic-level MOSFET can be used for Q2 if its absolute
gate-to-source voltage rating exceeds the maximum voltage
applied to PV
CC
.
Schottky Selection
Rectifier D2 is a clamp that catches the negative inductor
swing during the dead time between turning off the lower
MOSFET and turning on the upper MOSFET. The diode
must be a Schottky type to prevent the lossy parasitic
MOSFET body diode from conducting. It is acceptable to
omit the diode and let the body diode of the lower MOSFET
clamp the negative inductor swing, but efficiency will drop
one or two percent as a result. The diode's rated reverse
breakdown voltage must be greater than the maximum input
voltage.
+12V
PGND
ISL6522B
GND
LGATE
UGATE
PHASE
BOOT
VCC
+5V OR +12V
FIGURE 9. UPPER GATE DRIVE - BOOTSTRAP OPTION
NOTE:
V
G-S
V
CC
- V
D
NOTE:
V
G-S
PVCC
C
BOOT
D
BOOT
Q1
Q2
PVCC
+5V
OR +12V
D2
+
-
V
D
+
-
+12V
PGND
LGATE
UGATE
PHASE
BOOT
VCC
+5V OR LESS
FIGURE 10. UPPER GATE DRIVE - DIRECT V
CC
DRIVE OPTION
NOTE:
V
G-S
V
CC
- 5V
NOTE:
V
G-S
PVCC
Q1
Q2
PVCC
+5V
OR +12V
D2
ISL6522B
GND
+
-
ISL6522B
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