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參數(shù)資料
| 型號： | IR3086M |
| 廠商： | International Rectifier |
| 英文描述： | RESISTOR 2.2 OHM 35W TO220 |
| 中文描述： | 相位IC帶OVP，故障及超溫檢測 |
| 文件頁數(shù)： | 11/15頁 |
| 文件大小： | 417K |
| 代理商： | IR3086M |
IR3086
Page 11 of 15
9/1/03
IR3086 THEORY OF OPERATION
Block Diagram
The Block diagram of the IR3086 is shown in figure 6 and specific features discussed in the following section.
RAMP
COMPARATOR
CLOCK
PULSE
GENERATOR
PWM
COMPARATOR
+
-
10K
+
-
+
-
+
-
+
-
+
-
+
-
+
-
+
-
+
-
+
-
+
-
+
-
+
-
+
-
VCC
RMPIN+
RMPIN-
EAIN
ISHARE
PWMRMP
SCOMP
BIASIN
LGND
GATEH
VCCH
PGND
GATEL
CSIN+
CSIN-
VCCL
HOTSET
VRHOT
PHSFLT
DACIN
INTERNAL
CIRCUIT
BIAS
SHARE
ADJUST
ERROR
AMP
RAMP
SLOPE
ADJUST
20mV
PWM
LATCH
RESET
DOMINANT
S
R
0% DUTY
CYCLE
COMPARATOR
SYSTEM
REFERENCE
VOLTAGE
X
0.91
GATE
NON-OVERLAP
COMPARATORS
CURRENT
SENSE
AMP
X34
2V
OVP
VOLTAGE
PROPORTIONAL
TO ABSOLUTE
TEMPERATURE
ENABLE
RAMP
DISCHARGE
CLAMP
FAULT
130mV
+
+
VRHOT
COMPARATOR
Figure 6 – IR3086 Block Diagram
Tri-State Gate Drivers
The gate drivers can deliver up to 3A peak current. An adaptive non-overlap circuit monitors the voltage on the
GATEH and GATEL pins to prevent MOSFET shoot-through current while minimizing body diode conduction.
An Enable signal is provided by the Control IC to the Phase IC without the additional of a dedicated signal line. The
Error Amplifier output of the Control IC drives low in response to any fault condition such as input under voltage or
output overload. The IR3086 0% duty cycle comparator detects this and drives both gate outputs low. This tri-state
operation prevents negative inductor current and negative output voltage during power-down.
The Gate Drivers revert to a high impedance “off” state at VCCL and VCCH supply voltages below the normal
operating range. An 80k
resistor is connected across the GATEX and PGND pins to prevent the GATEX voltage
from rising due to leakage or other cause under these conditions.
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