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LM2578A/LM3578A是一款开关稳压器，设计用于实现诸如降压（buck）、升压（boost）、反相（inverting）和单端变压器配置等DC-DC电压转换电路。这款芯片的主要特点包括： 1. **反相和非反相反馈输入**：LM2578A具有独立的反相和非反相输入引脚，这为电路设计提供了更大的灵活性，允许根据需要选择负反馈或正反馈。 2. **1.0V参考电压**：每个输入引脚都内置了一个1.0V的参考电压，简化了电路设计，减少了外部元件的需求。 3. **宽工作电源电压范围**：可在2V至40V的输入电压范围内正常工作，这使得该器件适用于各种电源条件。 4. **高达750mA的输出电流**：输出电流能力可达750mA，且饱和电压低于0.9V，保证了高效能的电源转换。 5. **电流限制和热关断保护**：内置电流限制功能可防止过载，并有热关断保护，以防止因过热而损坏芯片。 6. **高达90%的占空比**：允许用户通过调整外部电容来设置开关频率，范围从约1Hz到100kHz（典型值），以适应不同的应用需求。 7. **设计灵活性**：输出集电极和发射极引脚便于设计，外部电流限制端子可以根据应用需求连接到地线或Vin端。 8. **应用广泛**：适用于开关稳压器、电机速度控制、闪光灯等多种应用场景。 9. **封装与连接图**：提供PDIP和SOIC封装，图1展示了封装的连接方式。 10. **生产数据**：产品符合发布日期时的生产数据，且符合Texas Instruments的标准保修条款。TI的产品适用于非关键应用，对于在关键应用中的使用，TI不承担额外责任。 LM2578A/LM3578A是LM2578的改进版本，提高了总供电电压和输出晶体管发射极及集电极电压的最大额定值，增强了器件的可靠性和性能。其灵活的特性使其成为各种电源转换应用的理想选择。用户在设计时应参考数据手册提供的详细规格和安全操作区(SOA)信息，以确保正确和安全的使用。

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LM2578A, LM3578A

www.ti.com

SNVS767E –AUGUST 2000–REVISED APRIL 2013

LM2578A/LM3578A Switching Regulator

Check for Samples: LM2578A, LM3578A

FEATURES

DESCRIPTION

The LM2578A is a switching regulator which can

• Inverting and Non-Inverting Feedback Inputs

easily be set up for such DC-to-DC voltage

• 1.0V Reference at Inputs

conversion circuits as the buck, boost, and inverting

• Operates from Supply Voltages of 2V to 40V

configurations. The LM2578A features a unique

comparator input stage which not only has separate

• Output Current up to 750 mA, Saturation Less

pins for both the inverting and non-inverting inputs,

than 0.9V

but also provides an internal 1.0V reference to each

• Current Limit and Thermal Shut Down

input, thereby simplifying circuit design and p.c. board

• Duty Cycle up to 90%

layout. The output can switch up to 750 mA and has

output pins for its collector and emitter to promote

design flexibility. An external current limit terminal

APPLICATIONS

may be referenced to either the ground or the V

• Switching Regulators in Buck, Boost,

terminal, depending upon the application. In addition,

Inverting, and Single-Ended Transformer

the LM2578A has an on board oscillator, which sets

Configurations

the switching frequency with a single external

capacitor from <1 Hz to 100 kHz (typical).

• Motor Speed Control

• Lamp Flasher

The LM2578A is an improved version of the LM2578,

offering higher maximum ratings for the total supply

voltage and output transistor emitter and collector

voltages.

Connection Diagram

Figure 1. PDIP/SOIC Package

See Package Number D0008A or P0008E

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of

Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

2All trademarks are the property of their respective owners.

PRODUCTION DATA information is current as of publication date.

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.

LM2578A, LM3578A

www.ti.com

SNVS767E –AUGUST 2000–REVISED APRIL 2013

Electrical Characteristics

These specifications apply for 2V ≤ V

≤ 40V (2.2V ≤ V

≤ 40V for T

≤ −25°C), timing capacitor C

= 3900 pF, and 25% ≤

duty cycle ≤ 75%, unless otherwise specified. Values in standard typeface are for T

= 25°C; values in boldface type apply

for operation over the specified operating junction temperature range.

Typical

(1)

LM2578A/

Symbol Parameter Conditions LM3578A Units

Limit

(2)

OSCILLATOR

OSC

Frequency 20 kHz

24 kHz (max)

16 kHz (min)

Δf

OSC

/ΔT Frequency Drift with Temperature −0.13 %/°C

Amplitude 550 mV

p-p

REFERENCE/COMPARATOR

(3)

Input Reference I

= I

= 0 mA and 1.0 V

Voltage

= I

= 1 mA ±1%

(4)

1.050/1.070 V (max)

0.950/0.930 V (min)

ΔV

/ΔV

Input Reference Voltage Line I

= I

= 0 mA and 0.003 %/V

Regulation

= I

= 1 mA ±1%

(4)

0.01/0.02 %/V (max)

INV

Inverting Input Current I

= I

= 0 mA, duty cycle = 25% 0.5 μA

Level Shift Accuracy Level Shift Current = 1 mA 1.0 %

10/13 % (max)

ΔV

/Δt Input Reference Voltage Long Term 100 ppm/1000h

Stability

OUTPUT

(sat) Collector Saturation Voltage I

= 750 mA pulsed, Emitter 0.7 V

grounded

0.90/1.2 V (max)

(sat) Emitter Saturation Voltage I

= 80 mA pulsed, 1.4 V

= V

= 40V 1.7/2.0 V (max)

CES

Collector Leakage Current V

= V

= 40V, Emitter grounded, 0.1 μA

Output OFF

200/250 μA (max)

CEO(SUS)

Collector-Emitter Sustaining Voltage I

SUST

= 0.2A (pulsed), V

= 0 60 V

50 V (min)

CURRENT LIMIT

Sense Voltage Shutdown Level Referred to V

or Ground 110 mV

See

(5)

80 mV (min)

160 mV (max)

ΔV

/ΔT Sense Voltage Temperature Drift 0.3 %/°C

Sense Bias Current Referred to V

4.0 μA

Referred to ground 0.4 μA

(1) Typical values are for T

= 25°C and represent the most likely parametric norm.

(2) All limits specified at room temperature (standard type face) and at temperature extremes (bold type face). Room temperature limits are

100% production tested. Limits at temperature extremes are specified via correlation using standard Statistical Quality Control (SQC)

methods. All limits are used to calculate AOQL.

(3) Input terminals are protected from accidental shorts to ground but if external voltages higher than the reference voltage are applied,

excessive current will flow and should be limited to less than 5 mA.

(4) I

and I

are the external sink currents at the inputs (refer to Test Circuit).

(5) Connection of a 10 kΩ resistor from pin 1 to pin 4 will drive the duty cycle to its maximum, typically 90%. Applying the minimum Current

Limit Sense Voltage to pin 7 will not reduce the duty cycle to less than 50%. Applying the maximum Current Limit Sense Voltage to pin 7

is certain to reduce the duty cycle below 50%. Increasing this voltage by 15 mV may be required to reduce the duty cycle to 0%, when

the Collector output swing is 40V or greater (see Ground-Referred Current Limit Sense Voltage typical curve).

Product Folder Links: LM2578A LM3578A

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