參數(shù)資料
型號(hào)： HIP6005
廠商： Intersil Corporation
英文描述： Buck Pulse-Width Modulator (PWM) Controller and Output Voltage Monitor(脈沖帶寬調(diào)節(jié)控制和輸出電壓檢測(cè)電路)
中文描述： 降壓脈寬調(diào)制（PWM）控制器和輸出電壓監(jiān)視器（脈沖帶寬調(diào)節(jié)控制和輸出電壓檢測(cè)電路）
文件頁(yè)數(shù)： 10/12頁(yè)
文件大小： 203K
代理商： HIP6005
10
temperature by calculating the temperature rise according
to package thermal-resistance specifications. A separate
heatsink may be necessary depending upon MOSFET
power, package type, ambient temperature and air flow.
Standard-gate MOSFETs are normally recommended for
use with the HIP6005. However, logic-level gate MOSFETs
can be used under special circumstances. The input voltage,
upper gate drive level, and the MOSFETs absolute
gate-to-source voltage rating determine whether logic-level
MOSFETs are appropriate.
Figure 10 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 schottky diode, D2,
conducts. Logic-level MOSFETs can only be used if the
MOSFETs absolute gate-to-source voltage rating exceeds
the maximum voltage applied to V
CC
.
Figure 11 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 +12VDC for the bias, the gate-to-source voltage
of Q1 is 7V. A logic-level MOSFET is a good choice for Q1
under these conditions.
Schottky Selection
Rectifier D2 conducts when the upper MOSFET Q1 is off. The
diode should be a Schottky type for low power losses. The
power dissipation in the schottky rectifier is approximated by:
In addition to power dissipation, package selection and
heatsink requirements are the main design trade-offs in
choosing the schottky rectifier. Since the three factors are
interrelated, the selection process is an iterative procedure.
The maximum junction temperature of the rectifier must
remain below the manufacturer’s specified value, typically
125
o
C. By using the package thermal resistance specification
and the schottky power dissipation equation (shown above),
the junction temperature of the rectifier can be estimated. Be
sure to use the available airflow and ambient temperature to
determine the junction temperature rise.
P
COND
= I
O2
r
DS(ON)
D
P
SW
= 1/2 I
O
V
IN
t
SW
F
S
Where: D is the duty cycle = V
OUT
/ V
IN
,
t
SW
is the switching interval, and
F
S
is the switching frequency.
+12V
HIP6005
GND
UGATE
PHASE
BOOT
VCC
+5V OR +12
NOTE: V
G-S
≈
V
CC
- V
D
.
FIGURE 10. UPPER GATE DRIVE - BOOTSTRAP OPTION
(NOTE)
C
BOOT
D
BOOT
Q1
D2
+
-
+ V
D
-
+12V
HIP6005
GND
UGATE
PHASE
BOOT
V
CC
+5V OR LESS
Q1
+
-
IGURE 11. UPPER GATE DRIVE - DIRECT V
CC
DRIVE OPTION
D2
NOTE:
V
G-S
≈
V
CC
-5V
P
COND
= I
0
x V
f
x (1 - D)
Where: D is the duty cycle = V
OUT
/ V
IN
, and
V
f
is the Schottky forward voltage drop
HIP6005
相關(guān)PDF資料
PDF描述
HIP6006 Buck and Synchronous-Rectifier Pulse-Width Modulator (PWM) Controller
HIP6006CB Buck and Synchronous-Rectifier Pulse-Width Modulator (PWM) Controller
HIP6007 Buck Pulse-Width Modulator (PWM) Controller
HIP6007CB Buck Pulse-Width Modulator (PWM) Controller
HIP6008 Buck Pulse-Width Modulator (PWM) Controller and Output Voltage Monitor
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
HIP6005A 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
HIP6005ACB 制造商:Rochester Electronics LLC 功能描述:- Bulk
HIP6005ACB-T 制造商:Rochester Electronics LLC 功能描述:- Bulk
HIP6005B 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
HIP6005BCB 制造商:Rochester Electronics LLC 功能描述:PWM CONTROLLER 3.5 TO 1.3V DAC RANGE,20LD SOIC - Bulk
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