JRC NJM2367TLA2050, NJM2367TA2050 Datasheet

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NJM2367

5.5A HIGH POWER DC/DC CONVERTER CONTROLLER IC

■GENERAL DESCRIPTION ■PACKAGE OUTLINE

NJM2367

The inducing basic function of DC/DC converter controller, which consists precision reference voltage, fixed frequenc oscillator, high gain error amplifier, precision output switch, cycle-by-cycle current limit, under voltage lockout, and thermal shutdown circuit.

NJM2367

The external parts, and realize low power stand-by mode.

■FEATURES

●Operating Voltage (7.5V to 40V)

●PWM form Switching Power Supply Control

●Internal High Power Transistor 5.5A (min.)

●Fixed Frequency Oscillator 72kHz (typ.)

●Internal Current Sense Amplifier

●Internal Under Voltage Lockout

●Internal Thermal Shutdown Circuit

●Bipolar Technology

●Package Outline TO-22O(5PIN)

■BLOCK DIAGRAM

is a high power DC/DC converter controlle

is suitable for step-down converter with fe

1 2 3 4 5

NJM2367TA2050 NJM2367TLA2050

PIN FUNCTION 1:V

FB

2:SW

OUT

3:GND

+

4:V 5:STBY (V

COMP

)

4

Reference Voltage

ON/OFF

Under Voltage

Lockout

Standby Circuit

VREF

Current Sense Amplifier

Oscillator

PWM Comparator

5.5A Power Transistor

Current Circh Transistor

Thermal Shutdown

Ratch Circuit

Error Amplifier

S

R

2

Q

VREF

1

5

3

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Ver 2.1

NJM2367

■ABSOLUTE MAXIMUM RATINGS (Ta=25°C )

PARAMETER SYMBOL RATINGS UNIT

Maximum Supply Voltage V+ 40 V Switch Output Voltage Vo Voltage Feedback and Compensation Input Voltage Range

(SWITCH)

V

FB,VCOMP

Power Dissipation

Operating Junction Temperature Operating Temperature Range Storage Temperature Range

Topr Ts tg

■THERMAL CHARACTERISTICS

Thermal

Resistance

Junction-to-Ambient Temperature θja 70

Junction-to-Case θjc 6.5

■POWER DISSIPATION vs. AMBIENT TEMPERATURE

P

Tj

-0.5 ∼ +Vin

-0.3 ∼ +7.0

D

TO-220 (5PIN)

16(T

46°C)

C

-40 ∼ +150

-40 ∼ +85

-50 ∼ +150

V

W

°C °C °C

°C/W

(T

=-40~+85°C, Tj= ~+150°C, PD=16W(T

opr

18

16

Heat Sink

14

(W)

D

12

θHS=5°C/W

10

θHS=10°C/W

8

6

θHS=20°C/W

4

Power Dissipation P

Without Heat Sink

2

0

25 50 75 100

Ambient Temperature Ta (°C)

C

46°C))

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NJM2367

■ELECTRICAL CHARACTERISTICS (V

+

=12V, Ta=25°C)

OSCILLATOR BLOCK

PARAMETER SYMBOL TEST CONDITIONS MIN. TYP. MAX. UNIT

Frequency fosc V+=7.5V 65 72 79 kHz

ERROR AMPLIFIER BLOCK

PARAMETER SYMBOL TEST CONDITIONS MIN. TYP. MAX. UNIT

Voltage Feedback

VFB(th) 4.9 5.0 5.1 V Input Threshold Line Regulation REG·Line

+

V

=7.5 ∼ 40V

– 0.03 0.08 %/V Input Bias Current IB VFB=VFB(th)+0.15V – 0.15 1.0 μA Ripple Rejection PSRR Output Voltage Swing VOH

V

OL

+

V

=10 ∼ 20V

Isource=75μA,V Isink=0.4mA,V

FB

=5.3V

FB

=4.7V

– 80 – dB

4.2 –

4.9

1.6

–

1.9

V V

PWM COMPARATOR BLOCK

PARAMETER SYMBOL TEST CONDITIONS MIN. TYP. MAX. UNIT

Duty Cycle Maximum Minimum

DC

(MAX)

(MIN)

V

=0V

FB

V

=5.3V

FB

– 0

95

0

– 0

% %

SWITCH OUTPUT BLOCK

PARAMETER SYMBOL TEST CONDITIONS MIN. TYP. MAX. UNIT

Output Voltage Saturation V

OFF-State Leakage Isw Current Limit Threshold Ipk Switching Times

Output Voltage Rise Time Output Voltage Fall Time

V+=7.5V,Isource=5.5A – V+-1.5 V+-1.8 V

SAT

V+=40V,SW

(off)

(SWITCH)

V+=7.5V 5.5 6.5 8.0 A

tr tf

V V

+

=40V,R

+

=40V,R

=0V – 0 100 μA

OUT

=7.7Ω,VFB=0V

OUT

=7.7Ω,VFB=0V

OUT

– –

100

50

UNDER VOLTAGE LOCKOUT BLOCK

PARAMETER SYMBOL TEST CONDITIONS MIN. TYP. MAX. UNIT

Startup Threshold V

Hysteresis V

TH(UVLO)

H(UVLO)

V+ Increasing 5.9 6.3 6.7 V

V+ Decreasing 0.6 0.8 1.0 V

TOTAL DEVICE

PARAMETER SYMBOL TEST CONDITIONS MIN. TYP. MAX. UNIT

Standby-State

Icc

STBY 0.1V – 36 100 μA

(stby)

Power Supply Current Operating-State Power Supply Current

Icc V+=40V,VFB=0V

duty·cycle=MAX

– 40 53 mA

Keep the limit of maximum power dissipation not to operate thermal shutdown. Low duty cycle pulse test is used to close its junction temperature to ambient temperature.

– –

nS nS

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