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參數(shù)資料
| 型號： | CS5124XD8 |
| 廠商： | ON SEMICONDUCTOR |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 1.5 A SWITCHING CONTROLLER, 440 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封裝： | SOIC-8 |
| 文件頁數(shù)： | 8/11頁 |
| 文件大?。?/td> | 168K |
| 代理商： | CS5124XD8 |
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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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| CS5124XD8G | 功能描述:電流型 PWM 控制器 Hi Performance Current Mode PWM RoHS:否 制造商:Texas Instruments 開關(guān)頻率:27 KHz 上升時間: 下降時間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數(shù)量:1 最大工作溫度:+ 105 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TSSOP-14 |
| CS5124XDR8 | 功能描述:電流型 PWM 控制器 Hi Performance RoHS:否 制造商:Texas Instruments 開關(guān)頻率:27 KHz 上升時間: 下降時間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數(shù)量:1 最大工作溫度:+ 105 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TSSOP-14 |
| CS5124XDR8G | 功能描述:電流型 PWM 控制器 Hi Performance Current Mode PWM RoHS:否 制造商:Texas Instruments 開關(guān)頻率:27 KHz 上升時間: 下降時間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數(shù)量:1 最大工作溫度:+ 105 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體: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: |
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