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参数资料
| 型号： | IRU3046CFTR |
| 厂商： | International Rectifier |
| 文件页数： | 3/20页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM VM 24TSSOP |
| 标准包装： | 1 |
| PWM 型： | 电压模式 |
| 输出数： | 2 |
| 频率 - 最大： | 450kHz |
| 占空比： | 90% |
| 电源电压： | 5 V ~ 12 V |
| 降压： | 是 |
| 升压： | 无 |
| 回扫： | 无 |
| 反相： | 无 |
| 倍增器： | 无 |
| 除法器： | 无 |
| Cuk： | 无 |
| 隔离： | 无 |
| 工作温度： | 0°C ~ 70°C |
| 封装/外壳： | 24-TSSOP（0.173"，4.40mm 宽） |
| 包装： | 剪切带 (CT) |
| 产品目录页面： | 1384 (CN2011-ZH PDF) |
| 其它名称： | *IRU3046CFTR IRU3046CFCT |
IRU3046
PARAMETER
SYM
TEST CONDITION
MIN
TYP
MAX
UNITS
Soft-Start Section
Charge Current
SS IB
SS=0V
15
25
30
m A
Power Good Section
Fb1 Lower Trip Point
Fb1 Upper Trip Point
Fb2 Lower Trip Point
Fb2 Upper Trip Point
Fb3 Lower Trip Point
Fb3 Upper Trip Point
PG FB1L
PG FB1H
PG FB2L
PG FB2H
PG FB3L
PG FB3H
Fb1 Ramping Down
Fb1 Ramping Up
Fb2 Ramping Down
Fb2 Ramping Up
Fb3 Ramping Down
Fb3 Ramping Up
0.9 V REF
1.1 V REF
0.9 V REF
1.1 V REF
0.9 V REF
1.1 V REF
V
V
V
V
V
V
Power Good Voltage OK
V PG
5K resistor pulled up to 5V
4.5
4.8
5
V
Error Amp Section
Fb Voltage Input Bias Current
Fb Voltage Input Bias Current
Transconductance 1
Transconductance 2
I FB1
I FB2
g m1
g m2
SS=3V
SS=0V
-0.1
-64
400
600
m A
m A
m mho
m mho
Input Offset Voltage for PWM2
V OS(ERR)2
Fb2 to V P2
-2
0
+2
mV
Oscillator Section
Frequency
Freq
Rt=Open
180
200
220
KHz
Rt=Gnd
300
350
450
Ramp Amplitude
V RAMP
1.25
V
Output Drivers Section
Rise Time
Fall Time
Dead Band Time
Tr
Tf
T DB
C L =1500pF
C L =1500pF
50
35
50
150
100
100
250
ns
ns
ns
Max Duty Cycle
Min Duty Cycle
T ON
T OFF
Fb=1V, Freq=200KHz
Fb=1.5V
85
0
90
0
%
%
LDO Controller Section
Drive Current
I LDO
30
45
mA
Fb Voltage
Input Bias Current
V FB LDO
I LDO(BIAS)
1.225
1.25
0.5
1.275
2
V
m A
PIN DESCRIPTIONS
PIN#
1
2
3
21
4
PIN SYMBOL
V REF
Vp2
Fb2
Fb1
Vcc
PIN DESCRIPTION
Reference Voltage.
Non-inverting input to the second error amplifier. In the current sharing mode, it is con-
nected to the programming resistor. In independent 2-channel mode it is connected to
V REF pin when Fb2 is connected to the resistor divider to set the output voltage.
Inverting inputs to the error amplifiers. In current sharing mode, Fb1 is connected to a
resistor divider to set the output voltage and Fb2 is connected to programming resistor to
achieve current sharing. In independent 2-channel mode, these pins work as feedback
inputs for each channel.
Supply voltage for the internal blocks of the IC.
5,6
Comp1, Comp2 Compensation pins for the error amplifiers.
7
8
9
16
Rt
Sync
VcH2
VcH1
The switching frequency can be programmed between 200KHz and 400KHz by connect-
ing a resistor between Rt and Gnd. By floating the pin, the switching frequency will be
200KHz and by grounding the pin, the switching frequency will be 400KHz.
The internal oscillator may be synchronized to an external clock via this pin.
Supply voltage for the high side output drivers. These are connected to voltages that must
be at least 4V higher than their bus voltages (assuming 5V threshold MOSFET). A mini-
mum of 1 m F, high frequency capacitor must be connected from these pins to PGnd to
provide peak drive current capability.
Rev. 1.9
09/27/02
www.irf.com
3
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