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参数资料
| 型号： | B38C44 |
| 英文描述： | BiCMOS Current Mode PWM Controller |
| 中文描述： | 的BiCMOS电流模式PWM控制器 |
| 文件页数： | 4/5页 |
| 文件大小： | 213K |
| 代理商： | B38C44 |
Bay Linear, Inc
2418 Armstrong Street, Livermore, CA 94550 Tel: (925) 606-5950, Fax: (925) 940-9556 www.baylinear.com
B38C4X
Startup & Operating Voltage Selection Guide
UVLO Thresholds
Duty Cycle
Star-Up at 8.4V
Operating Min= 7.6V
B38C43
B38C45
Star-Up at 14.5V
Operating Min= 9.0V
B38C42
B38C44
0% to 96%
0% to 50%
Pin Descriptions
Pin No.#
1
2
3
4
Name
COMP
FB
ISNS
RT/CT
Function
Output of error amplifier & input to PWM comparator
Inverting input of error amplifier
Current sense comparator input. It is internally limited to 1V
Oscilator RC timing component connection. Resistor RT is connected to
V
REF
and capacitro CT is conencted to ground. Different values of RT
and CT determine the maximum duty cycle..
Combined pwoer and analog ground
High-power, toten-pole driver output. OUT pin is activly held LOW
when V
CC
is below the UVLO threshold.
Suply votlage input
5Volt reerence votlage output
5
6
GND/PGND
OUT
7
8
V
DD
V
REF
Application Notes:
The Bay Linear B38C4X devices are compatible with
generic 384x PWM devices. The following discussion
highlights the differences and advantages of the Bay C
design.
Start- up Current
Bau Linear BiCMOS process allows for substantial
reduction in the start- up current. Typical start- up
current is 95 μ A, with a maximum limit of 120 μ A.
Low start- up current allows high resistance, lower-
wattage, start- up resistors to supply controller start-
up power
.
Output Driver
The B38C4x CMOS output stage drives external
power MOSFETs to the full supply voltage. Low ON-
resistance and high peak current drive combine to give
greater than 1000pF gate capacitance drive capability.
Rise and fall time requirements may dictate the
appropriate value of output capacitance. Within the
restrictions of output capacity and controller power
dissipation, switching frequencies
can exceed 1MHz.
The CMOS output stage “ break- before- make”
action is guaranteed by design and insures that no
cross- conduction current will flow. This
minimizes heat dissipation, increases efficiency
and enhances reliability.
Oscilator Operation
Two external components, RT and CT, set the
switching frequency.
With VCC = 14V, RT = 10k and CT = 3.3nF,
nominal switching frequency is 50kHz.
B38C4X
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相关代理商/技术参数 |
参数描述 |
|---|---|
| B38C44M | 制造商:未知厂家 制造商全称:未知厂家 功能描述:BiCMOS Current Mode PWM Controller |
| B38C44P | 制造商:未知厂家 制造商全称:未知厂家 功能描述:BiCMOS Current Mode PWM Controller |
| B38C45 | 制造商:未知厂家 制造商全称:未知厂家 功能描述:BiCMOS Current Mode PWM Controller |
| B38C45M | 制造商:未知厂家 制造商全称:未知厂家 功能描述:BiCMOS Current Mode PWM Controller |
| B38C45P | 制造商:未知厂家 制造商全称:未知厂家 功能描述:BiCMOS Current Mode PWM Controller |
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