參數(shù)資料
型號(hào)： S-8327
廠(chǎng)商： Seiko Instruments Inc.
英文描述： CMOS PWM-Control Step-Up Switching Regulator(External Transistor)(CMOS PFM（頻率脈沖調(diào)制）控制步升開(kāi)關(guān)穩(wěn)壓器)
中文描述： 的CMOS脈寬調(diào)制控制升壓開(kāi)關(guān)穩(wěn)壓器（外部晶體管）（烤瓷的CMOS（頻率脈沖調(diào)制）控制步升開(kāi)關(guān)穩(wěn)壓器）
文件頁(yè)數(shù)： 2/65頁(yè)
文件大小： 569K
代理商： S-8327
Seiko Instruments Inc.
1
S-8323/8327 Series
SMALL PACKAGE PWM CONTROL
STEP-UP SWITCHING REGULATOR
The S-8323/8327 Series is a CMOS PWM-control step-up switching
regulator which mainly consists of a reference voltage source, an
oscillation circuit, a power MOS FET (for S-8323 Series) , and an error
amplifier. The new PWM control circuit automatically changes the duty
ratio from 0% to 83% according to the current load, offering products of
a wide range, high efficiency. A step-up switching regulator is
constructed by externally connecting only a coil, a capacitor and a diode
to the S-8323 Series. This feature, along with its small package and low
current consumption, makes the S-8323 Series ideal for the power
supply of portable equipment. For applications requiring a high output
current, products used with an external transistor (S-8327 Series) are
also available.
Features
Applications
Low voltage operation: 0.9 V (I
OUT
= 1mA)
Low current consumption :
During operation: 17.2
μ
A (typ.)
Power supplies for portable equipment such as
pagers, handy calculators, and remote controllers
Constant voltage power supplies for cameras,
video equipment, and communications equipment
Power supply for microcomputers
(V
OUT
= 3 V, 50 kHz)
During shutdown : 0.5
μ
A (max.)
Duty ratio:
Built-in PWM control circuit
External parts: coil, diode, and capacitor only
(a transistor is needed for the S-8327 Series.)
Output voltage: accuracy of ±2.4%
Soft start function: 6 msec (typ.)
Shutdown function
External transistor type is available (S-8327 Series)
SOT-23-5 small plastic package
SOT-23-3 small plastic package
SOT-89-3 miniature power molded plastic package
Step-down and voltage-inverting type are available.
Block Diagram
(1)
S-8323 Series
(2)
S-8327 Series
Figure 1 Block Diagram
(ON / OFF)
EXT
(ON / OFF)
V
SS
V
OUT
CONT
PWM
control
circuit
-
+
VREF
V
SS
V
OUT
PWM
control
circuit
-
+
VREF
Soft start circuit
Soft start circuit
相關(guān)PDF資料
PDF描述
S-8324 CMOS PWM/PFM-Control Step-Up Switching Regulator(CMOS PWM/PFM控制步升開(kāi)關(guān)穩(wěn)壓器)
S-8328 CMOS PWM/PFM-Control Step-Up Switching Regulator(CMOS PWM/PFM控制步升開(kāi)關(guān)穩(wěn)壓器)
S-8330 Step-Up Switching Regulator For LCD Bias Supply(用于LCD偏置電源的步升開(kāi)關(guān)穩(wěn)壓器)
S-8331 Step-Up Switching Regulator For LCD Bias Supply(用于LCD偏置電源的步升開(kāi)關(guān)穩(wěn)壓器)
S-8340 PWM Control High-Frequency Step-Up Switching Regulator-Controllers(PWM控制，高頻步升開(kāi)關(guān)穩(wěn)壓器-控制器)
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