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參數(shù)資料
| 型號(hào)： | HIP6014 |
| 廠商： | Intersil Corporation |
| 英文描述： | Buck and Synchronous-Rectifier (PWM) Controller and Output Voltage Monitor |
| 中文描述： | 巴克和同步整流（PWM）控制器和輸出電壓監(jiān)視器 |
| 文件頁(yè)數(shù)： | 10/12頁(yè) |
| 文件大?。?/td> | 211K |
| 代理商： | HIP6014 |
10
Standard-gate MOSFETs are normally recommended for
use with the HIP6014. However, logic-level gate MOSFETs
can be used under special circumstances. The input voltage,
upper gate drive level, and the MOSFET’s absolute gate-to-
source voltage rating determine whether logic-level
MOSFETs are appropriate.
Figure 9 shows the upper gate drive (BOOT pin) supplied by
a bootstrap circuit from V
CC
. The boot capacitor, C
BOOT
develops a floating supply voltage referenced to the PHASE
pin. This supply is refreshed each cycle to a voltage of V
CC
less the boot diode drop (V
D
) when the lower MOSFET, Q
2
turns on. Logic-level MOSFETs can only be used if the
MOSFET’s absolute gate-to-source voltage rating exceeds
the maximum voltage applied to V
CC
.
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 Q
1
is 7V. A logic-
level MOSFET is a good choice for Q
1
and a logic-level
MOSFET can be used for Q
2
if its absolute gate-to-source
voltage rating exceeds the maximum voltage applied to V
CC.
Schottky Selection
Rectifier D
2
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
HIP6014
GND
LGATE
UGATE
PHASE
BOOT
V
CC
+5V or +12V
NOTE:
V
G-S
≈
V
CC
-V
D
NOTE:
V
G-S
≈
V
CC
C
BOOT
D
BOOT
Q1
Q2
+
-
FIGURE 9. UPPER GATE DRIVE - BOOTSTRAP OPTION
D2
+ V
D
-
+12V
PGND
HIP6014
GND
LGATE
UGATE
PHASE
BOOT
V
CC
+5V OR LESS
NOTE:
V
G-S
≈
V
CC
-5V
NOTE:
V
G-S
≈
V
CC
Q
1
Q
2
+
-
FIGURE 10. UPPER GATE DRIVE - DIRECT V
CC
DRIVE OPTION
D
2
HIP6014
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| HIP6014CB | Buck and Synchronous-Rectifier (PWM) Controller and Output Voltage Monitor |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| HIP6014CB | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| HIP6014CB WAF | 制造商:Harris Corporation 功能描述: |
| HIP6014CB-T | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| HIP6015 | 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:Buck Pulse-Width Modulator (PWM) Controller and Output Voltage Monitor |
| HIP6015 WAF | 制造商:Harris Corporation 功能描述: |
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