参数资料
| 型号： | SP6136ER1-L/TR |
| 厂商： | Exar Corporation |
| 文件页数： | 10/18页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM VM 16-QFN |
| 标准包装： | 3,000 |
| PWM 型： | 电压模式 |
| 输出数： | 1 |
| 频率 - 最大： | 680kHz |
| 占空比： | 92% |
| 电源电压： | 5 V ~ 24 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： | 16-VFQFN 裸露焊盘 |
| 包装： | 带卷 (TR) |
APPLICATION INFORMATION
θ JA = { T J(MAX) - T A(MAX) ) } /
LpisduetowiringandPCBtracesconnecting
input capacitors and switching MOSFETs.
For typical Lp of 2nH and V IN of 2V, di/dt
is 1A/ns. Substituting for di/dt in equation
(6) we get Q GD = 2 nC.
In selecting a package type, the main con-
siderations are cost, power/current handling
capability and space constraints. A larger
package in general offers higher power and
current handling at increased cost. Package
selection can be narrowed down by calculat-
ing the required junction-to-ambient thermal
resistance θ JA :
........... (7)
P (MAX)
Where: T J(MAX) is the die maximum tem-
perature rating, T A(MAX) is maximum ambient
temperature, and P (MAX) is maximum power
dissipated in the die.
It is common practice to add a guard-band
of 25?C to the junction temperature rating.
Following this convention, a 150?C rated
MOSFET will be designed to operate at 125?C
(i.e., T J(MAX) = 125?C). P (MAX) = 0.88W (from
section 4) and T A(MAX) = 40?C as specified in
the design example. Substituting in equation
(7) we get θ JA = 96.6 ?C/W.
side regulation. The PWRGD pin can be
connected to VCC with an external 10K W
resistor. During startup, output regulates
when Soft Start (SS) reaches 0.8V (the refer-
ence voltage). PWRGD is enabled when SS
reaches .6V. PWRGD output can be used
as a “Power on Reset”. The simplest way to
adjust delay of the “Power on Reset” signal
with respect to V OUT in regulation is with the
Soft Start Capacitor (C SS ) and is given by:
C SS = (Iss ? Tdelay)/0.8 where Iss is the Soft
Start charge current ( 0μA nominal).
Under Voltage Lock Out (UVLO)
The SP6 36 has two separate UVLO com-
parators to monitor the bias (Vcc) and Input
(V IN ) voltages independently. The Vcc UVLO
is internally set to 4.25V. The V IN UVLO is
programmable through UV IN pin. When
UVIN pin is greater than 2.5V the SP6 36
is permitted to start up pending the removal
of all other faults. A pair of internal resistors
is connected to UVIN as shown in figure 4.
Therefore without external biasing the V IN
start threshold is 9.5V. A small capacitor may
be required between UVIN and GND to filter
out noise. For applications with V IN of 5V or
3.3V, connect UVIN directly to V IN .
SP613X
For the top MOSFET, we now have deter-
mined the following requirements; BV DSS =
30V, R DS(ON) = 0.7m W , Q GD = 2 nC and θ JA
< 96.6?C/W. An SO-8 MOSFET that meets the
requirements is Vishay-Siliconix’s Si4394DY;
BV DSS = 30V, R DS(ON) = 9.75m W @ V GS = 4.5V,
Q GD = 2. nC and θ JA = 90 ?C/W.
R4
R5
VIN
UVIN
40 K
2.5V ON
2.2V OFF
50K
+
-
GND
The bottom MOSFET has the requirements of
BV DSS = 30V and R DS(ON) = 5.4m W . Vishay-
Siliconix’s Si4320DY meets the requirements;
BVdss = 30V, R DS(ON) = 4m W @ Vgs = 4.5V.
Power Good
Power Good (PWRGD) is an open drain
output that is pulled low when V OUT is out-
Figure 4- Internal and external bias of UVIN
To program the V IN start threshold, use a
pair of external resistors as shown. If external
resistors are an order of magnitude smaller
Oct 3 -06 Rev L
SP6 36 Synchronous Buck Controller
0
? 2006 Sipex Corporation
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相关代理商/技术参数 |
参数描述 |
|---|---|
| SP6137 | 制造商:SIPEX 制造商全称:Sipex Corporation 功能描述:Wide Input, 900KHz Synchronous PWM Controller |
| SP6137CU | 制造商:Exar Corporation 功能描述:SMPS Controller |
| SP6137CU/TR | 制造商:Exar Corporation 功能描述:SMPS Controller |
| SP6137CU-L | 功能描述:开关变换器、稳压器与控制器 Wide Input, 900KHz Synchronous RoHS:否 制造商:Texas Instruments 输出电压:1.2 V to 10 V 输出电流:300 mA 输出功率: 输入电压:3 V to 17 V 开关频率:1 MHz 工作温度范围: 安装风格:SMD/SMT 封装 / 箱体:WSON-8 封装:Reel |
| SP6137CU-L/TR | 功能描述:开关变换器、稳压器与控制器 Wide Input, 900KHz Synchronous RoHS:否 制造商:Texas Instruments 输出电压:1.2 V to 10 V 输出电流:300 mA 输出功率: 输入电压:3 V to 17 V 开关频率:1 MHz 工作温度范围: 安装风格:SMD/SMT 封装 / 箱体:WSON-8 封装:Reel |
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