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详细说明
RS2132 is a cost effective PWM power switch optimized for off‐line low power AC/DC applications including battery chargers
和适配器。它工作在初级侧感应和调节，从而光耦合器431不是必需的。所有权
内置CV和CC控制可以实现高精度的恒流/恒压控制满足大多数适配器和充电器的应用
要求“。
启动电流和启动控制
Startup current of RS2132 is designed to be very low so that VDD could be charged up above UVLO threshold and starts up
快。大阻值启动电阻可以被用来减少在应用中的功率损耗。
工作电流
The Operating current of RS2132 is as low as 2.5mA. Good efficiency is achieved with the low operating current together with
多模式控制功能。
软启动
RS2132 features an internal soft start to minimize the component electrical over‐stress during power on startup. As soon as
VDD达到UVLO （OFF）状态时，控制算法就会逐渐斜坡的峰值电流阈值电压接近零，以
normal setting of 0.90V. Every restart is a soft start.
CC / CV操作
RS2132 is designed to produce good CC/CV control characteristic as shown in the Fig. 1.
在充电器应用中，放电电池开始充电，在恒流曲线部分，直到它接近满充电，并
顺利开关曲线的CV部进行操作。
在一个交流/直流适配器，正常操作仅发生在曲线的CV部。消委会部分提供输出
电流限制。中的CV操作中，输出电压通过初级侧控制调节。在恒流模式，
RS2132 will regulate the output current constant regardless of the output voltage drop.
工作原理
To support RS2132 proprietary CC/CV control, system needs to be designed in DCM mode for flyback system (Refer to Typical
应用框图） 。
在DCM中的回扫转换器中，输出电压可以通过辅助绕组来感测。在MOSFET导通时，
负载电流从输出滤波电容器C供给
O
。电流在初级绕组线性上升。当MOSFET
关断时，初级电流转移到次级处的振幅
I
S
=
N
P
×
I
P
N
S
The auxiliary voltage reflects the output voltage as shown in fig.2 and it is given by
V
AUX
=
N
AUX
×
(V
O
+ Δ
V)
N
S
其中，ΔV表示输出二极管的电压降。
DS‐RS2132‐03
九月
2009
www.Orister.com
ORISTER [ ORISTER CORPORATION ]
