参数资料
| 型号： | MAX8536EVKIT |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 3/7页 |
| 文件大小： | 0K |
| 描述： | EVAL KIT FOR MAX8536 |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 1 |
| 主要目的： | 电源管理，O 环控制器/负荷分载 |
| 已用 IC / 零件： | MAX8536 |
| 已供物品： | 板 |
MAX8536 Evaluation Kit
Frequency = 5 ? 100 μ A ?
?
R 5 = R 6 ?
? 1 ?
a 10MΩ device). To increase turn-off speed under fault
conditions, decrease or remove C1.
TIMER
The IC controller features a dual-purpose TIMER input
that sets the charge-pump frequency or functions as a
logic enabler. The EV kit circuit provides a 3-pin jumper
(JU1) to configure the TIMER pin. Place a shunt across
pins 2-3 of JU1 to shut down the IC. Place a shunt
across pins 1-2 of JU1 to connect the TIMER pin to
ground through R7 to set the charge-pump frequency
to 250kHz. Removing the shunt from JU1 leaves the
TIMER pin unconnected and sets the charge-pump fre-
quency to 500kHz. An open-drain/open-collector tran-
sistor can also be connected to the TIMER PCB pad to
control the IC controller. Assert a logic-low signal
(below 0.5V) to the TIMER PCB pad to shut down the
controller. Verify that the shunt is removed from JU1
when using an external device to control the IC (see
Table 1 for JU1 configurations).
The charge-pump frequency can be reconfigured
between 100kHz and 500kHz by replacing R7. Use the
following equation to select a new resistor value for R7:
? 1.25V ? kHz
? R7 ? μ A
where Frequency is the desired charge-pump frequency.
UVP Threshold
The EV kit UVP threshold is programmed to 2.9V with
external resistors R3 and R4. If the voltage at PS_OUT+
drops below this threshold, the IC controller turns off N1
and N2 by discharging the GATE pin and asserting a
logic low on the FAULT output. The controller returns to
normal operation and pulls FAULT to V BUS+ if the input
voltage exceeds the UVP threshold. The UVP threshold
can be reconfigured by replacing R3 and R4. Use the
following formula to select new resistor values:
where UVP is the desired undervoltage protection
threshold and R4 is between 10k Ω and 50k Ω . The
undervoltage threshold must be programmed to be
greater than the internal UVLO threshold of 2.7V (typ).
Removing R3 and R4 and leaving the PC board pads
open disables the UVP function.
OVP Threshold
The EV kit OVP threshold is programmed to 5.75V with
external resistors R5 and R6. The IC controller turns off
the MOSFETs, asserts a logic low on the FAULT output,
and latches off when an overvoltage fault condition is
detected. An overvoltage fault condition is detected
only if the voltage at VBUS+ exceeds this threshold and
the forward-current condition is established. The for-
ward-current condition is defined when both MOSFETs
are on and the voltage drop from PS_OUT+ to VBUS+
is greater than 0.01V (typ). A voltage drop greater than
0.01V is achieved when a minimum current of 1.6A
(typ) (1.6A x 7m Ω of R DS(ON) > 0.01V) flows from
PS_OUT+ to VBUS+. Cycling the TIMER or PS_OUT+
inputs low resets the EV kit.
The OVP threshold can be reconfigured by replacing R5
and R6. Use the following formula to select new resistor
values:
? OVP ?
? 1.25V ?
where OVP is the desired overvoltage protection thresh-
old and R4 is between 10k Ω and 50k Ω . Removing R5
and shorting R6 disables the OVP function.
When the selective OVP feature is not required, remove
N1 and short its source and drain pads.
R 3 = R 4 ?
? 1 ?
? UVP
? 1.25V
Table 1. Jumper JU1
?
?
SHUNT
POSITION
1-2
2-3
Not Installed
TIMER PIN
Connected to ground through R7
Connected to ground
Floating (connected to the TIMER PCB pad*)
EV KIT FUNCTION
Normal operation. Charge-pump frequency programmed to 250kHz.
Shutdown mode
Normal operation. Charge-pump frequency defaults to 500kHz.
*User can connect to the TIMER PCB pad and supply a logic signal.
_______________________________________________________________________________________
3
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| MAX8537EEI | 功能描述:DC/DC 开关控制器 RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| MAX8537EEI+ | 功能描述:DC/DC 开关控制器 Dual-Synchronous Buck Controller RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| MAX8537EEI+T | 功能描述:DC/DC 开关控制器 Dual-Synchronous Buck Controller RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| MAX8537EEI-T | 功能描述:DC/DC 开关控制器 RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| MAX8537EVKIT | 功能描述:DC/DC 开关控制器 RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
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