超小型负电压模块

TNC16XXXDW

1A, -0.8V~-12V, NEGATIVE POWER MODULE

特性

? 1A 负电压输出 ? 小型封装

? 输入电压范围：4.5V to 14V ? 输出电压范围：-0.8V to -8V ? 效率高达85% ? 可选工作温度区间 A 级: -20 o C to 70 o C B 级: -30 o C to 85 o C C 级: -40 o C to 125 o C ? 低压自动保护 ? 过载自动保护 ? 超温自动保护 ? 快速瞬态响应 ? 具有软启动功能 ? 轻载条件具有省电调节 ? 500kHz 开关频率

? 下方允许高度1mm 元件放置

应用

? 复杂多电平系统 ? 数模/模数转换器 ? 信号调理 ? 运算放大器

描述

TNC16XXXDW 系列具有固定/可调电压输出和输出使能控制。轻载省电调节功能特别适合低功耗应用。由于具有极高的效率、极低的损耗，以及经过一定的热力学设计，TNC16XXXDW 系列能够提供1A 的输出带载能力。 高性价比、高稳定性以及微型体积帮助TNC16XXXDW 在科研设备、工业控制以及医疗领域成为明星产品。 输出过载保护和超温保护可以有效的对付电路故障，保护系统万全。

低压保护对于正在调试的系统或者干扰很大的系统具有很好的保护效果，可以避免昂贵的处理器受到电源系统冲击受损。

Realtimin 工程师为了减小模块体积和易于安装性上花费了大量心血。模块使用双面贴装，最大化减小体积，并在此基础上设计了可供直插和贴装的引脚。. 模块使用无铅工艺生产，满足RoHS 标准。

模块一览 (硬币大小：一角)

Rev. A Information furnished by Realtime Instruments is believed to be accurate and reliable. However, no responsibility is assumed by Realtime Instruments for its use, nor for any infringements of patents or other rights of third parties that may result from its use. Specifications subject to change

without notice. No license is granted by implication or otherwise under any patent or patent rights of Realtime Instruments. Trademarks and registered trademarks are the property of their respective owners.

SPECIFICATIONS ELECTRICAL CHARACTERISTICS

Electrical Characteristics

(1) Lower than -8 V is safe, but set-point error may deteriorate 1%.

(2) This control pin has an internal pull-up. Do not place an external pull-up on this pin. If it is left open-circuit, the module operates when input power is applied. If need to control, a small, low-leakage (<100 nA) MOSFET is recommended for control. For additional information, see the related application note.

(3) At least one 47 μF electrolytic input capacitor is recommended for better operation. The electrolytic capacitor must be rated for a minimum of 500 mA rms of ripple current.

(4) Output Capacitor must be MLCC type for its lower ESR characteristics.

ENVIRONMENTAL AND ABSOLUTE MAXIMUM RATINGS

Environmental and Absolute Maximum Ratings

PIN CONFIGURATION AND FUNCTION DESCRIPTIONS

TNC16XXXDW

Pin Configuration

Pin Function Descriptions

Coding Descriptions

Output Selection

TYPICAL PERFORMANCE CHARACTERISTICS

VI=12V, Unless otherwise noted, TA = 25℃

Efficiency vs Load Current Output Variation vs Load Current

Output Variation vs Temperature Vout Ripple vs Load Current

Thermal Operating Area (Grade B)Operating Frequency

TERMINOLOGY

Line Regulation

Line regulation refers to the change in output voltage in response to a given change in input voltage and is expressed in percent per volt, ppm per volt, or μV per volt change in input voltage. The input voltage accounts for the variation of switching duty cycle.

Load Regulation

Load regulation refers to the change in output voltage in response to a given change in load current and is expressed in μV per mA, ppm per mA, or ohms of dc output resistance. The load current accounts for the effects of self-heating.

Overcurrent Threshold

For protection against load faults, all modules incorporate output overcurrent protection. Applying a load that exceeds the regulator's overcurrent threshold causes the regulated output to shut down.

Over-Temperature Protection (OTP)

When the junction temperature increases above the rising threshold temperature, the module will enter the over-temperature protection state. The thermal sensor allows the converters to start a start-up process and regulate the output voltage again after the junction temperature cools by 45 o C. The OTP designed with a 45 o C hysteresis increases lifetime of the module.

Transient Response

The transient response has been characterized using a load transient with a di/dt of 2.5 A/μs. The typical voltage deviation for this load transient is given with the minimum required value of output capacitance. As the di/dt of a transient is increased, the response of a converter’s regulation circuit ultimately depends on its output capacitor decoupling network. This is an inherent limitation with any dc/dc converter once the speed of the transient exceeds its bandwidth capability. This also means when a dc/dc converter has better transient response, the less output decoupling capacitor it need.

Soft-Start Power Up

The TNC16XXXDW integrates soft-start circuits to ramp up the output voltage of the converter to the programmed regulation set point at a predictable slew rate. The slew rate of output voltage is internally controlled to limit the inrush current through the output capacitors during soft start process.

Long-Term Stability

Long-term stability refers to the shift in the output voltage at 60o C after 1000 hours of operation in a 60o C environment. The ambient temperature is kept at 60o C to ensure that the temperature chamber does not

switch randomly between heating and cooling, which can cause instability over the 1000 hours’ measurement. APPLICATION INFORMATION

Basic connection

Typical Application Circuit

Input Capacitors

TNC16XXXDW requires none minimum input capacitance. When V O> 3V, a 47μF electrolytic capacitor is recommended. Adding optionally one or more 10μF MLCC capacitor will always get better EMC results for the module.

Output Capacitor

TNC16XXXDW requires none minimum output capacitance due to its great transient characteristics. But adding optional one or more 22μF MLCC capacitor will improve ripple and transient performance. A combination of two 22μF MLCC capacitors is recommended.

On/Off Inhibit

For applications requiring output voltage on/off control, the TNC16XXXDW incorporates an EN control pin. The inhibit feature can be used wherever there is a requirement for the regulator to be turned off. The power modules function normally when the Inhibit pin is left open-circuit, providing a regulated output whenever a valid source voltage is connected to VI with respect to Vout. Open or 2V above GND= Normal operation, Vout = Off.

This pin is a high voltage input, which has internal pull-up to VIN. It is hazardous to connect any low-level digital output driver directly to this pin, such as TTL logic or CMOS logic. Adopt a transistor to protect digital driver (usually IOs).

Interfacing with IO

Under-Voltage Protection

In the process of operation, if a short circuit occurs, the output voltage will drop quickly. When load current is bigger than current limit threshold value, the output voltage will fall out of the required regulation range. The under-voltage protection circuit continually monitors the output voltage after soft-start is completed. If a load step is strong enough to pull the output voltage lower than the under voltage threshold, the under voltage threshold is 70% of the nominal output voltage, the internal UVP delay counter starts to count. After 16ms de-bounce time, the device turns off both high side and low-side MOSEFET with latched. T oggling enable pin to low, or recycling VIN, will clear the latch and bring the chip back to operation.

Current Limit Protection

The TNC16XXXDW modules protect against load faults with a continuous current limit characteristic. Under a load fault condition the output current cannot exceed the current limit value. Attempting to draw current that exceeds the current limit value causes the output voltage to be progressively reduced. Current is continuously supplied to the fault until it is removed. Upon removal of the fault, the output voltage will promptly recover.

Thermal Shutdown

Thermal shutdown protects the module’s internal circuitry against excessively high temperatures. A rise in temperature may be the result of a drop in airflow, a high ambient temperature, or a sustained current limit condition. If the junction temperature of the internal components exceeds T otp, the module will shut down. This reduces the output voltage to zero. The module will start up automatically, by initiating a soft-start power up when the sensed temperature decreases 40 °C below the thermal shutdown trip point.

Power-Up Characteristics

During start period, the TNC16XXXDW power modules produce a regulated output voltage whenever of a valid input voltage (minimum VIN) is applied from Vin. During the power-up period, internal soft-start circuitry slows the rate that the output voltage rises. This reduces the in-rush current drawn from the input source. The soft-start circuitry also introduces a short time delay into the power-up characteristic. The delay is from the point that a valid input source is recognized, to the initial rise of the output voltage.

Soft Start

TNC16XXXDW has an internal controlled timer for soft start function, which is fixedly set around 1ms.

Adjusting Vout

There is an output adjustment resistor mounted on top side of TNC16XXXDW. The adjustment range of the TNC16XXXDW is -0.6V to -8 V. The adjustment method requires replacement of the resistor, RSET. The requirement of RSET is 0603(1608) package, 1/16W, 1% accuracy or higher, good thermal stability.

For other output voltages, the value of the required resistor can either be calculated using the following formula, or simply selected from the range of values given in T able. The location of RSET is showing in next

chapter.

R SET=11kΩ×

0.6 Vo?0.6

RSET for Standard Output Voltages

Grade Selection and Thermal Consideration

Realtimin guarantee the correct behavior of the module over the full temperature range of corresponding grade. For highest grades, Realtimin not only employs better ICs and components, which has better temperature stabilization and better precision, but also adopts more producing procedure to ensure about 30% allowance. But when working under high ambient temperature (for example 85°C or higher, as shown in Thermal Operation Area), thermal protection function would limit MOSFET self-heating margin and eventually limit output current inevitably. Considering specific application environment, it might be necessary to take additional heat-sinking measures to improve the output capability when working under high ambient temperature, including:

1.Deploy silicone grease to connect bottom side and mounting board to achieve better thermal coupling.

2.Deploy silicone grease on top side to gain better thermal uniformity.

3.Install heat radiator.

https://www.360docs.net/doc/417435900.html,e fan or other methods to strengthen air flow.

OUTLINE DIMENSIONS

Top View 0.036(0.9)

0.126(3.2)

0.055(1.4)

0.126(3.2)

SMT-PAD

NOTES:

(1) All linear dimensions are in inches(mm)

(2) This drawing is subject to change without notice.

(3) 2 place decimals are ±0.030(±0.76mm).

(4) 3 place decimals are ±0.010(±0.25mm).

(5) Recommended keep out area for user components.

(6) Power pin connection should utilize two or more vias to The interior power plane of 0.025(0.63) I.D. per input,

ground and output pin (or the electrical equivalent).

(7) Paste screen opening: 0.080(2.03) to 0.085(2.16). Paste screen thickness: 0.006(0.15).

(8) Pad type: Solder mask defined.

(9) All pins: Material – Copper Alloy plated by Nickel.

ORDERING GUIDE

Ordering Guide

(1) XXX refers to Coding Description.

(2) The marketing status values are defined as follows:

ACTIVE: Product device recommended for new designs.

LIFEBUY: Realtimin has announced that the device will be discontinued, and a lifetime-buy period is in effect.

NRND: Not recommended for new designs. Devices is in production to support existing customers, using it in a new design is not recommended.

PREVIEW: Device has been announced but is not in production. Samples may or may not be available.

OBSOLETE: Realtimin has discontinued the production of the device.