参数资料
型号: IRU3146CFTR
厂商: International Rectifier
文件页数: 5/30页
文件大小: 0K
描述: IC REG CTRLR BUCK PWM VM 28TSSOP
标准包装: 1
PWM 型: 电压模式
输出数: 2
频率 - 最大: 345kHz
占空比: 85%
电源电压: 4.5 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 ~ 70°C
封装/外壳: 28-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: *IRU3146CFTR
IRU3146CFCT
IRU3146
PIN DESCRIPTIONS
PIN#
26
27
28
PIN SYMBOL
V P2
V REF
Gnd
PIN DESCRIPTION
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.
Reference Voltage. The drive capability of this pin is about 2uA.
Analog ground for internal reference and control circuitry. Connect to PGnd plane with a
short trace.
1) These pins should not go negative (-0.5V), this may cause instability for the gate drive circuits. To prevent this,
a low forward voltage drop diode is required between these pins and ground as shown in Figure 1.
BLOCK DIAGRAM
Vcc
2
SS2 / SD
SS1 / SD
8
20
25uA 25uA
64uA
Max
64uA
Mode
VcH1
VcH2
4.2V / 4.0V
3.5V / 3.3V
3.5V / 3.3V
Bias
Generator
UVLO
POR
3V
0.8V
V P2
0.8V
Mode
Control
POR
Mode
18
17
VcH1
HDrv1
POR
0.8V
Error Amp1
PWM Comp1
Thermal
Shutdown
R
0.3V
SS1
SS1
14
15
16
V CL
LDrv1
PGnd1
S
Fb1
Comp1
Rt
22
21
4
Ramp1
Ramp2
Two Phase
Oscillator
Q
Set1
Reset Dom
Set2
3uA
20uA
19
OCSet1
Sync
V REF
24
27
0.8V
PWM Comp2
Reset Dom
S
Q
SS1
SS2
Hiccup
Control
10
11
25
VcH2
HDrv2
Hiccup
V P2
26
Error Amp2
R
Mode
0.3V
13
LDrv2
Fb2
Comp2
6
7
SS2
SS2
12
PGnd2
V SEN1
23
PGood / OVP
OVP
HDrv OFF / LDrv ON
3uA
20uA
9
OCSet2
V SEN2
5
Gnd
28
Regulator
1
3
PGood
V OUT3
Figure 3 - Block diagram of IRU3146.
Rev. 1.1
6/25/04
www.irf.com
5
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