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参数资料
| 型号： | CS5124XDR8 |
| 厂商： | ON SEMICONDUCTOR |
| 元件分类： | 稳压器 |
| 英文描述： | 1.5 A SWITCHING CONTROLLER, 440 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封装： | SOIC-8 |
| 文件页数： | 8/11页 |
| 文件大小： | 168K |
| 代理商： | CS5124XDR8 |
CS5124
http://onsemi.com
6
+
VCC UVLO COMP
VREF = 5.0 V
OSC
DIS
RAMP
V5REF
VREFOK
GND
ISENSE
VFB
GATE
VCC
UVLO
BIAS
SS
S
R
Q
F3
V5REF
VCC
LINE AMP
2.0 V
V
V 1.91 V/1.83 V
2.62 V/2.45 V
TSHUT
7.7 V/7.275 V
G2
G6
V
÷
490 mV
10 mA
F2
S
R
Q
L
INE UVLO COMP
REMOTE
(SLEEP) COMP
150°C/125°C
SS AMP
BLANKING
1000 W
DRIVER
G7
G1
G3
S
R
Q
F1
BLANK
ICOMP
2ND
SET DOMAIN
RESET DOMAIN
170 mV/ms
+
VCC
+
+
+
+
+
+
+
+
+
+
4500 W
1.32 V
2.90 V
SS COMP
SoftStart LATCH
PWM COMP
VFB COMP
60 mV
ENABLE
G5
275 mV
1/10
V
2.9 R
R
Figure 2. Block Diagram
THEORY OF OPERATION
Powering the IC
VCC can be powered directly from a regulated supply and
requires 500
mA of startup current. The CS5124 includes a
line bias pin (BIAS) that can be used to control a series pass
transistor for operation over a wide input voltage. The BIAS
pin will control the gate voltage of an Nchannel MOSFET
placed between VIN and VCC to regulate VCC at 8.0 V.
VCC and UVLO Pins
The UVLO pin has three different modes; low power
shutdown, Line UVLO, and normal operation. To illustrate
how the UVLO pin works; assume that VIN, as shown in the
application schematic, is ramped up starting at 0 V with the
UVLO pin open. The SS and ISENSE pins also start at 0 V.
While the UVLO is below 1.8 V, the IC will remain in a low
current sleep mode and the BIAS pin of the CS5124 is
internally clamped to a maximum of 15 V. When the voltage
on the UVLO pin rises to between 1.8 V and 2.6 V the
reference for the VCC UVLO is enabled and VCC is
regulated to 8.0 V by the BIAS pin, but the IC remains in a
UVLO state and the output driver does not switch. When the
UVLO pin exceeds 2.6 V and the VCC pin exceeds 7.7 V, the
GATE pin is released from a low state and can begin
switching based on the comparison of the ISENSE and VFB
pins. The SoftStart capacitor begins charging from 0 V at
10
mA. As the capacitor charges, a buffered version of the
capacitor voltage appears on the VFB pin and the VFB
voltage begins to rise. As VFB rises the duty cycle increases
until the supply comes into regulation.
SoftStart
SoftStart is accomplished by clamping the VFB pin 1.32 V
below the SS pin during normal start up and during restart
after a fault condition. When the CS5124 starts, the
SoftStart capacitor is charged from a 10
mA source from 0
V to 4.9 V. The VFB pin follows the SoftStart pin offset
by 1.32 V until the supply comes into regulation or until
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相关代理商/技术参数 |
参数描述 |
|---|---|
| CS5124XDR8G | 功能描述:电流型 PWM 控制器 Hi Performance Current Mode PWM RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
| CS5126-KL | 制造商:Rochester Electronics LLC 功能描述: 制造商:Cirrus Logic 功能描述: |
| CS5126-KLZ | 制造商:Rochester Electronics LLC 功能描述: 制造商:Cirrus Logic 功能描述: |
| CS5126-KP | 制造商:Rochester Electronics LLC 功能描述:2-CH 16-BIT SUCCESSIVE APPROXIMATION ADC, - Bulk |
| CS5126XDR8 | 功能描述:IC REG CTRLR FLYBK ISO PWM 8SOIC RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:4,000 系列:- PWM 型:电压模式 输出数:1 频率 - 最大:1.5MHz 占空比:66.7% 电源电压:4.75 V ~ 5.25 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:-40°C ~ 85°C 封装/外壳:40-VFQFN 裸露焊盘 包装:带卷 (TR) |
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