参数资料
型号: IR3094MPBF
厂商: International Rectifier
文件页数: 11/29页
文件大小: 0K
描述: IC REG CTRLR BUCK PWM VM 48MLPQ
标准包装: 200
PWM 型: 电压模式
输出数: 3
频率 - 最大: 540kHz
占空比: 100%
电源电压: 8 V ~ 16 V
降压:
升压:
回扫:
反相:
倍增器:
除法器:
Cuk:
隔离:
工作温度: 0°C ~ 150°C
封装/外壳: 48-MLPQ
包装: 剪切带 (CT)
IR3094PBF
PWM Operation
The IR3094 is a fully integrated 3 phase interleaved PWM control IC which uses voltage mode control with trailing
edge modulation. A high-gain wide-bandwidth voltage type Error Amplifier in the Control IC is used for the voltage
control loop. The PWM block diagram of the IR3094 is shown in Figure 2.
U30
IROSC
CLK1
CLK2
CLK2
PWM COMPARATOR
RSFF
S
Q
OSCBLOCK
CLK3
CLK3
-
+
QB
R
RESET DOMINANT
VIN
OVP SET
OVP LATCH
S
Q
IROSC/2
GATEH1
1
2
VREF
OVP RESET
R
QB
GATEL1
RCS1
CCS1
CDAC
9p
0.6V
RDAC
VOSNS-
VDAC
ERROR AMPLIFIER
CCOMP
FB
IROSC
0.575V
0% DUTY CYCLE
CLK2
PWM COMPARATOR
RSFF
S
Q
GATEH2
VIN
VOUT SENSE+
RCOMP
EAOUT
-
+
QB
R
RESET DOMINANT
GATEL2
1
2
VOUT+
COUT
RDRP
VDRP
VDRP BUFFER
Share Adjust Error Amp
IROSC
RCS2
CCS2
VOUT-
VOUT SENSE-
RFB
+
-
0 TO IROSC*3/4
9p
0.6V
SCOMP2
CSC2
RSC2
PWM COMPARATOR
EAOUT
-
+
CLK3
RSFF
S
Q
QB
R
RESET DOMINANT
GATEH3
GATEL3
VIN
1
2
Share Adjust Error Amp
IROSC
RCS3
CCS3
+
-
0 TO IROSC*3/4
9p
0.6V
SCOMP3
VDAC
CSC3
RSC3
VDAC
X23.5
X23.5
-
+
-
CSINM3
CSINP3
CSINM2
CSINP2
+
VDAC
X23.5
-
CSINM1
CSINP1
+
Figure 2 – PWM Block Diagram
Refer to Figure 3. Upon receiving a clock pulse, the RSFF is set, the internal PWM ramp voltage begins to
increase, the low side driver is turned off, and the high side driver is then turned on. For phase 1, an internal 9pf
capacitor is charged by a current source that proportional to the switching frequency resulting in a ramp rate of
50mV per percent duty cycle. For example, if the steady-state operating switch node duty cycle is 10%, then the
internal ramp amplitude is typically 500mV from the starting point (or floor) to the crossing of the EAOUT control
voltage. When the PWM ramp voltage exceeds the Error Amplifier’s output voltage, the RSFF is reset. This turns
off the high side driver, turns on the low side driver, and discharges the PWM ramp to 0.6V until the next clock
pulse.
Page 11 of 29
09/26/05
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