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参数资料
| 型号： | IRDC3065 |
| 厂商： | International Rectifier |
| 文件页数： | 10/15页 |
| 文件大小： | 0K |
| 描述： | LOW PWR SWTCH REG REF DESIGN KIT |
| 标准包装： | 1 |
| 主要目的： | DC/DC，负反相器 |
| 输出及类型： | 1，非隔离 |
| 输出电压： | -5V |
| 电流 - 输出： | 200mA |
| 输入电压： | 4 ~ 7 V |
| 稳压器拓扑结构： | 反相 |
| 频率 - 开关： | 1.2MHz |
| 板类型： | 完全填充 |
| 已供物品： | 板，软件 |
| 已用 IC / 零件： | IRU3065 |
| 产品目录页面： | 1383 (CN2011-ZH PDF) |
| 相关产品： | IRU3065CLCT-ND - IC REG CTRLR INV PWM SOT23-6 IRU3065CLTR-ND - IC REG CTRLR INV PWM SOT23-6 |
| 其它名称： | *IRDC3065 |
IRU3065(PbF)
THEORETICAL OPERATION
Operation-Regulation Mode
V g a te
reference of the chip, which is set to be 150mV (for
Vcc=5V), the flip-flop is reset and the PMOS is turned
off. The inductor current is discharged through diode
D2 to the load. The load voltage increases. When the
inductor current decreases to zero, the output current
is supplied by the output capacitor and the output volt-
age decreases until next cycle starts. In this mode, the
voltage at V SEN pin is controlled near zero. Therefore,
the output voltage is regulated at:
V in
-V OUT =
R3
R2
× V REF
V o lta g e a cro ss
th e in d u cto r
V out ? V D
In the evaluation board, the output voltage is regulated
at -5V, as shown in figure 7. The steady state of the
converter should be operated in this mode. One feature
in this mode is that the shaded inductor current in fig-
ure 18 stays unchanged. The average output diode cur-
In d u cto r
cu rre n t
I peak
rent equals output current. When the switching period
decreases and frequency goes up, the average diode
current increases to support more output current. The
O u tp u t o f cu rre n t
co m p a ra to r
switching frequency increases linearly when the load
current increases as shown in figure 20.
O u tp u t d io d e
cu rre n t
I out
5
6
5
4
? V out
=
R 3
R 2
? V ref
V out I out
3
2
1
0.75
0
0
0.16
0.32
0.48
0.64
0.8
t on
t 1
0.02
I out
0.8
T s
Figure 19 - Theoretical output voltage (-V OUT )
versus output current for IRU3065 controlled buck
boost evaluation board.(assume VIsen=0.2V)
Figure 18 - Operation waveforms of IRU3065 con-
1.083 . 10
1.5 . 10
6
6
trolled buck boost converter at regulation mode.
1.2 . 10
6
In general, IRU3065 controlled buck boost converter
9 . 10
5
is operated in two modes depending on the load cur-
rent. When the load current is small, the buck boost
f s I out
6 . 10
5
3 . 10
4.583 . 10
I out
operated in first mode (regulation mode). The operation
waveforms are shown in figure 18. In this mode, the
inductor current in the buck converter is discontinuous.
Basic Operation
When the voltage at V SEN pin is below zero, the flip-flop
inside the IC is set and the V GATE pin output low, which
trigger the PMOS in the power stage, the output induc-
tor current increases from zero. When sensed inductor
current voltage at I SEN pin reaches the internal current
5
4
0
0 0.2 0.4 0.6
0.02
Figure 20 - Theoretical switching frequency versus
output current for evaluation board.(assume
VIsen=0.2V)
0.8
0.8
10
www.irf.com
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| IRDC3073 | 功能描述:PWM CONTROLLER DESIGN KIT RoHS:否 类别:编程器，开发系统 >> 过时/停产零件编号 系列:- 标准包装:1 系列:- 类型:MCU 适用于相关产品:Freescale MC68HC908LJ/LK（80-QFP ZIF 插口） 所含物品:面板、缆线、软件、数据表和用户手册 其它名称:520-1035 |
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| IRDC3146 | 功能描述:KIT REFERENCE DESIGN W/IRU3146 RoHS:否 类别:编程器，开发系统 >> 过时/停产零件编号 系列:- 标准包装:1 系列:- 类型:MCU 适用于相关产品:Freescale MC68HC908LJ/LK（80-QFP ZIF 插口） 所含物品:面板、缆线、软件、数据表和用户手册 其它名称:520-1035 |
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