P1595G-AB5-R [UTC]

200KHZ, 1.5A PWM BUCK DC/DC CONVERTER; 为200KHz ， 1.5A PWM降压型DC / DC转换器


型号：	P1595G-AB5-R
厂家：	Unisonic Technologies
描述：	200KHZ, 1.5A PWM BUCK DC/DC CONVERTER 为200KHz ， 1.5A PWM降压型DC / DC转换器转换器
文件：	总6页 (文件大小：253K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

UNISONIC TECHNOLOGIES CO., LTD

P1595

LINEAR INTEGRATED CIRCUIT

200KHZ, 1.5A PWM BUCK

DC/DC CONVERTER

DESCRIPTION

The UTC P1595 is a monolithic integrated circuit intended for the

use of a step-down DC/DC converter and it can drive a 1.5A load

without additional transistors.

The internal compensation makes feedback control having good

line and load regulation without external design. The external

shutdown function can be controlled by logic level and then enter the

standby mode.

The UTC P1595 features a guaranteed +3% tolerance on

output voltage under specified input voltage and output load

conditions. Thermal shutdown protection is designed to prevent over

temperature operating from damage while current limit protection is

against over current operating of the output switch. The switching

frequency will be reduced if current limit function occurs and feedback

voltage (V_FB) drops below 0.5V. The UTC P1595 works at a 200kHz

switching frequency so it allows smaller sized filter components.

FEATURES

* Output Voltage In Adjustable Output Version.

* Adjustable Version Output Voltage Range: 0.75V ~ 22V With+3%

Accuracy.

* Short Circuit Protect

* Fixed Switching Frequency: 200KHZ.

* On/Off Shutdown Control Input.

* Voltage Mode Non-Synchronous Pulse Width Modulation (PWM)

Control.

* Thermal-Shutdown And Current-Limit Protection.

* Operating Voltage Can Be Up To 24V.

* 1.5A Output Load Current.

* Low Power Standby Mode.

* Built-In Switching Transistor

ORDERING INFORMATION

Ordering Number

Package

SOT-89-5

Packing

Lead Free

Halogen Free

P1595G-AB5-R

Tape Reel

P1595L-AB5-R

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LINEAR INTEGRATED CIRCUIT

PIN CONFIGURATION

PIN DESCRIPTION

PIN NO.

PIN NAME

DESCRIPTION

GND

Switching Output

Ground

Feedback Voltage

On/Off Pin

VCC

Operating Voltage Input

BLOCK DIAGRAM

V_CC

CURRENT

SOURCE

BIAS

0.75V

REFERENCE

2.5V

REGULATOR

START

COMP.

PWM

latch

Driver

Thermal

200KHz

OSC.

Shutdown

0.4V

GND

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LINEAR INTEGRATED CIRCUIT

ABSOLUTE MAXIMUM RATING (unless otherwise specified)

PARAMETER

SYMBOL

V_CC

RATINGS

+26

UNIT

Supply Voltage

ON/OFF Pin Input Voltage

Feedback Pin Voltage

V_EN

-0.3 ~ V_CC

-0.3 ~ 12

4.5~24

V_FB

Operating Supply Voltage

V_OP

Output Voltage to Ground

Power Dissipation (Note 1)

V_OUT

P_D

-0.8

690

T_A=25°C

Operating Temperature

T_OPR

-20 ~ +125

°C

Storage Temperature

T_STG

-65 ~ +150

°C

Note: Absolute maximum ratings are those values beyond which the device could be permanently damaged.

Absolute maximum ratings are stress ratings only and functional device operation is not implied.

THERMAL DATA

PARAMETER

SYMBOL

θ_JA

RATINGS

180

UNIT

°C/W

Junction to Ambient (Note 1)

Junction to Case (Note 1)

θ_JC

Note: 1. It’s Measured with the PCB copper area (need connect to V_SSpins) of approximately 1.5 in²(Multi-layer)

ELECTRICAL CHARACTERISTICS (T_A=25°C, V_CC=12V, I_LOAD=0.2A, unless otherwise specified)

PARAMETER

SYMBOL

V_FB

TEST CONDITIONS

I_OUT=0.2A

_OUT=1.5A, No outside circuit

V_FB=0V force driver on

V_FB=1.2V force driver off

I_OUT=0.1A

MIN

TYP

MAX UNIT

Feedback Voltage

0.728 0.750 0.773

Saturation Voltage

V_SAT

1.2

1.5

Quiescent Current

I_Q

-10

μA

Feedback Bias Current

Shutdown Supply Current

I_FB

I_SD

-50

V_EN=0V

Pear current, No outside circuit

V_FB=0V force driver on

No outside circuit

V_FB=1.0V force driver off

V_CC=24V force driver off

Current Limit

I_(LIMIT)

1.8

SW pin=0V

SW pin=-0.8V

-50

μA

SW Pin Leakage

Current

I_SW(LEAK)

-5

Oscillator Frequency

Oscillator Frequency Circuit Protect

of Short

F_OSC

F_SCP

140

200

260

KHz

(Adjustable) When V_FB<0.5V

KHz

Max. Duty Cycle (ON)

Min. Duty Cycle (OFF)

EN Pin Logic Input Threshold

Voltage

V_FB=1.2V force driver off

V_FB=0V force driver on

High (regulator ON)

Low (regulator OFF)

V_EN=2.5V (ON)

100

1.2

V_IH

V_IL

I_H

2.0

0.5

EN pin Logic Input Current

EN pin Input Current

Thermal Shutdown Temp

μA

°C

I_L

V_EN=0.3V (OFF)

-5

TSD

135

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LINEAR INTEGRATED CIRCUIT

TYPICAL APPLICATION CIRCUIT

Adjustable Output Voltage Version

⎛

⎞

⎟

V_OUT=V × 1+

, V =0.75V. R2=0.75K~4K

⎜

⎝

⎠

Resistor select for output voltage setting

V_OUT

1.2K

6.8K

4.7K

3.3V

2.5V

1.8V

1.5V

1.3V

1.2V

1.5K

1.2K

L1 recommend value (V_IN=12V, I_OUT=1.5A,)

V_OUT

1.8 V

2.5V

3.3V

L1 Value

22μH

33μH

FUNCTION DESCRIPTIONS

Pin Functions

Vcc

It provides the IC switching regulator with positive input supply. This pin is used to supply the switching currents

needed by the regulator and a suitable input bypass capacitor must be connected at this pin.

GND

Circuit ground.

Internal switch. The voltage at this pin switches between (+V_CC-V_SAT) and approximately-0.5V, with a duty cycle of

approximately V_OUT/ V_CC. To minimize coupling to sensitive circuitry, you should minimize the PC board copper area

connected to this pin.

Feedback

Senses the regulated output voltage to complete the feedback loop.

Using logic level signals to allow the switching regulator circuit to be shutdown, which dropping the total input

supply current to approximately 10uA. Shut the regulator down through pulling this pin below a threshold voltage of

approximately 0.5V, turn the regulator on through pulling this pin above 2.0V (up to V_CCMAX).

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LINEAR INTEGRATED CIRCUIT

TYPICAL CHARACTERISTICS

1. Startup during power on

2. Low-frequency triangle wave control enable pin

V_CC=24V

2500

5000

Time (500ms/div)

3. Control enable pin with power supply to normal

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LINEAR INTEGRATED CIRCUIT

TYPICAL CHARACTERISTICS(Cont.)

4. Transient response with step load

V_CC=12V

V_CC=24V

50mV

-50mV

1000

2000

500

1000

Time (200µs/div)

Time (100µs/div)

5. Efficiency

UTC assumes no responsibility for equipment failures that result from using products at values that

exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or

other parameters) listed in products specifications of any and all UTC products described or contained

herein. UTC products are not designed for use in life support appliances, devices or systems where

malfunction of these products can be reasonably expected to result in personal injury. Reproduction in

whole or in part is prohibited without the prior written consent of the copyright owner. The information

presented in this document does not form part of any quotation or contract, is believed to be accurate

and reliable and may be changed without notice.

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