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参数资料
| 型号： | MB39A136PFT-G-JN-ERE1 |
| 厂商： | Fujitsu Semiconductor America Inc |
| 文件页数： | 3/4页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM CM 24TSSOP |
| 标准包装： | 1 |
| PWM 型： | 电流模式 |
| 输出数： | 2 |
| 频率 - 最大： | 1MHz |
| 占空比： | 80% |
| 电源电压： | 4.5 V ~ 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： | -30°C ~ 85°C |
| 封装/外壳： | 24-TFSOP（0.173"，4.40mm 宽） |
| 包装： | 标准包装 |
| 其它名称： | 865-1154-6 |
N ew Products
MB39A135 ( 1-channel )
MB39A136 ( 2-channel )
(2-channel) operates on the clock shifted in phase by 180 ° .
s Overcurrent protection circuit (OCP function)
Photos 2 and 3 present the evaluation boards for MB39A135
and MB39A136. These products are offered with the following
package sizes:
Overcurrent status is detected by cyclically comparing the
current converted into voltage that runs when the High side
FET turns ON and the voltage set for the ILIM terminal.
When overcurrent status is detected, the High side FET is
turned OFF to let the output voltage drop. This function
●
●
TSSOP-16: 4.4mm × 5.0mm × 1.10mm (lead pitch 0.65mm)
TSSOP-24: 4.4mm × 6.5mm × 1.10mm (lead pitch 0.5mm)
?
prevents overcurrent status.
s Overvoltage protection circuit (OVP function)
When the product detects output voltage higher than the set
voltage, it turns OFF the High side FET and turns ON the
Low side FET. This function protects the devices on later stages
from overvoltage.
s Undervoltage protection circuit (UVP function)
When the product detects output
NOTES
* Other company names and brand names are the trademarks
or registered trademarks of their respective owners.
voltage lower than the set voltage, it will
stop the voltage output using the soft-
stop function. This function detects
output errors and protects the devices on
Figure 4 MB39A135 Block Diagram
later stages by stopping the output.
Vin
（4.5V～25V）
VREF
MODE
RT
VCC
s Overtemperature protection
<PFM Comp>
circuit (OTP function)
Clock
generator
Bias
Reg.
VB
When the junction temperature
reaches 160 ℃ , this product stops the
voltage output using the soft-stop
function. When the junction temperature
decreases to 135 ℃ , it resumes the voltage
output using the soft-start function. This
function prevents overheat of the IC.
R2
R1
A
CS
COMP
FB
Soft-Start
<Err Amp>
intref
2V
<I Comp>
CLK
RQ
S
Drive
Logic
Hi-side
Drive
VB
Lo-side
Drive
CB
DRVH
LX
DRVL
PGND
A
Vo
Figs.4 and 5 present the block
diagrams of MB39A135 and MB39A136,
respectively.
ILIM
<OVP Comp>
intref
Vs
S Q
R
Level
Converter
x1.15
Application
Examples
<UVP Comp>
intref
x0.7
S Q
R
uvlo
UVLO
VB
Fig.6
presents an application example.
H:UVLO
release intref
(0.7V)
ON/OFF
<REF> <CTL>
(3.3V)
CTL
Evaluation Board and
Package
VREF
GND
2007
No.5
FIND Vol.25
3
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