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参数资料
| 型号： | L6599D |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 稳压器 |
| 英文描述： | 0.8 A SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封装： | LEAD FREE, SOP-16 |
| 文件页数： | 8/36页 |
| 文件大小： | 636K |
| 代理商： | L6599D |
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Application information
L6599
16/36
7.1
Oscillator
The oscillator is programmed externally by means of a capacitor (CF), connected from pin 3
(CF) to ground, that will be alternately charged and discharged by the current defined with
the network connected to pin 4 (RFmin). The pin provides an accurate 2 V reference with
about 2 mA source capability and the higher the current sourced by the pin is, the higher the
oscillator frequency will be. The block diagram of Figure 22 shows a simplified internal
circuit that explains the operation.
The network that loads the RFmin pin generally comprises three branches:
1.
A resistor RFmin connected between the pin and ground that determines the minimum
operating frequency;
2.
A resistor RFmax connected between the pin and the collector of the (emitter-grounded)
phototransistor that transfers the feedback signal from the secondary side back to the
primary side; while in operation, the phototransistor will modulate the current through
this branch - hence modulating the oscillator frequency - to perform output voltage
regulation; the value of RFmax determines the maximum frequency the half-bridge will
be operated at when the phototransistor is fully saturated;
3.
An R-C series circuit (CSS + RSS) connected between the pin and ground that enables
to set up a frequency shift at start-up (see Chapter 7.3: Soft-start). Note that the
contribution of this branch is zero during steady-state operation.
Figure 22. Oscillator's internal block diagram
The following approximate relationships hold for the minimum and the maximum oscillator
frequency respectively:
L6599
2 V
+
-
4
RFmin
3
CF
S
Q
R
+
-
1 V
4 V
+
-
CF
IR
2KMIR
KMIR
RFmin
RFmax
RSS
CSS
KMIR
0.9V
3.9V
f
min
1
3CFRF
min
-------------------------------------
=
f
max
1
3CF
RF
min
RF
max
||
()
-----------------------------------------------------------------
=
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相关代理商/技术参数 |
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|---|---|
| L6599DTR | 功能描述:软开关 PWM 控制器 Hi Vltg resonant Controller RoHS:否 制造商:Fairchild Semiconductor 输出端数量: 输出电流: 开关频率: 工作电源电压:30 V 电源电流: 最大工作温度:+ 105 C 最小工作温度:- 40 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 封装:Reel |
| L6599N | 功能描述:软开关 PWM 控制器 Hi Vltg resonant Controller RoHS:否 制造商:Fairchild Semiconductor 输出端数量: 输出电流: 开关频率: 工作电源电压:30 V 电源电流: 最大工作温度:+ 105 C 最小工作温度:- 40 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 封装:Reel |
| L6599NR | 功能描述:电压模式 PWM 控制器 HV resonant CNTRL RoHS:否 制造商:Texas Instruments 输出端数量:1 拓扑结构:Buck 输出电压:34 V 输出电流: 开关频率: 工作电源电压:4.5 V to 5.5 V 电源电流:600 uA 最大工作温度:+ 125 C 最小工作温度:- 40 C 封装 / 箱体:WSON-8 封装:Reel |
| L6599TR | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:High-voltage resonant controller |
| L65B | 制造商:Electro-Mech 功能描述: |
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