PJ3842BCS datasheet, PDF - EEWORLD Datasheet

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PJ3842BCS: DescriptionSwitching Controller, Current-mode, 1A, 500kHz Switching Freq-Max, PDSO8, PLASTIC, SOP-8; CategoryPower/power management The power supply circuit; File Size373KB，15 Pages; ManufacturerPromax-Johnton Electronic Corporation

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PJ3842BCS Overview

Switching Controller, Current-mode, 1A, 500kHz Switching Freq-Max, PDSO8, PLASTIC, SOP-8

PJ3842BCS Parametric

Parameter Name	Attribute value
Maker	Promax-Johnton Electronic Corporation
Parts packaging code	SOIC
package instruction	SOP,
Contacts	8
Reach Compliance Code	unknown
ECCN code	EAR99
Analog Integrated Circuits - Other Types	SWITCHING CONTROLLER
control mode	CURRENT-MODE
Control Technology	PULSE WIDTH MODULATION
Maximum input voltage	30 V
Minimum input voltage	12 V
Nominal input voltage	15 V
JESD-30 code	R-PDSO-G8
length	4.9 mm
Number of functions	1
Number of terminals	8
Maximum operating temperature	85 °C
Minimum operating temperature	-20 °C
Maximum output current	1 A
Package body material	PLASTIC/EPOXY
encapsulated code	SOP
Package shape	RECTANGULAR
Package form	SMALL OUTLINE
Certification status	Not Qualified
Maximum seat height	1.75 mm
surface mount	YES
Switch configuration	SINGLE
Maximum switching frequency	500 kHz
Temperature level	OTHER
Terminal form	GULL WING
Terminal pitch	1.27 mm
Terminal location	DUAL
width	3.9 mm

PJ3842BCS Preview

PJ3842B

High Performance Current Mode Controller

he PJ3842B series is high performance fixed frequency

current mode controllers. This is specifi cally designed

Also included are protective features consisting of input

and reference undervoltage lockouts each with hysteresis,

cycle-by -cycle current limiting , programmable output

deadtime, and a latch for single pulse metering.

This device is available in 8-pin dual-in-line plastic

packages as well as the 8-pin plastic surface mount (SOP-8).

The SOP-8 package has separate power and ground pins fo r

the totem pole output stage.

The PJ3842B has UVLO thresholds of 16V (on) and

10V (off), ideally suited for off-line conv erters.

fo r Off-Line and DC-to-DC convert er applications offering

the designer a cost effective solution with minimal external

components.This integrated circuits

feature a trimmed

oscillator for precis e duty cycle control, a temperature

compensated reference, high gain error amplifier, current

sensing comparator,and a high current totem pole output

ideally suited for driving a power MOSFET.

FEATURES

•

Trimmed Oscillator Discharge Current for Precise Duty

Cycle Control

•

Current Mode Operation to 500KHz

Automatic Feed Forward Compensation

Latching PWM for Cycle-By-Cycl e Current Limiting

Internally

Lockout

•

High Current Totem Pole Output

Input Undervoltage Lockout with Hystersis

Low Start-Up and Operating Current

Trimmed

Reference

with

Undervoltag e

DIP-8

SOP-8

P in: 1. Compensation

2. Voltage Feedback

3. Current Sense

4. R

. Gnd

6. Output

7. Vcc

8. Vref

ORDERING INFORMATION

Device

PJ3842BCD

PJ3842BCS

Operating Temperature

-20℃ TO +85℃

Package

DIP-8

SOP-8

SIMPLIFIED BLOCK DIAGRAM

The document contains information on a new product.Specifications and information herein are subject to change without notice.

1-15

2002/01.ver.A

PJ3842B

High Performance Current Mode Controller

MAXIMUM RATING

Rating

Total Power Supply and Zener Current

Output Current Source or Sink (Note 1)

Output Energy (Capacitive Load per Cycle)

Current Sense and Voltage Feedback Inputs

Error Amp Output Sink Current

Power Dissipation and Thermal Characteristics

Plastic Dip

Maximum Power Dissipation @ T

=25℃

Thermal Resistance Junction to Air

Plastic Dip

Maximum Power Dissipation @ T

=25℃

Thermal Resistance Junction to Air

Operating Junction Temperature

Operature Ambient Temperature

Storage Temperature Range

Symbol

)

Vin

Value

1.0

5.0

-0.3 to +5.5

Unit

μJ

θJA

Tstg

862

145

1.25

100

+150

0 to +70

-65 to +150

℃/W

℃

ELECTRICAL CHARACT ERISTICS

= 15V (Note 2), R

=10K, C

=3.3nF, T

low

to T

high

(Note 3)

nless otherwise

PJ3842B

Typ

5.0

2.0

3.0

0.2

5.0

-85

Characteristic

Symbol

Min

Max

5.0

5.18

180

Unit

mV/℃

µV

KHz

REFERENCE SECTION

Reference Output Voltage (Io=1.0mA,T

= 25℃)

Vref

5.0

Line Regulation (V

=12V to 25V)

Regline

Load Regulation (Io =1.0mA to 20mA)

Regload

Temperature Stability

Total Output Variation over Line,Load ,and Temperature

Vref

4.82

Output Noise Voltage (f = 10Hz to 10kHz, T

=25℃)

Long Term Stability ( T

=125.℃ for 1000 Hours)

Output Short Circuit Current

Isc

-30

OSCILLATOR SECTION

Frequency

Fosc

=25℃

low

to T

high

Frequency Change with Voltage (V

=12V to 25V)

Δfos

c/ΔV

Frequency Change with Temperature

Δfos

c/ΔT

low

to T

high

Oscillator Voltage Swing ( Peak-to-Peak)

Vosc

Discharge Current (Vosc=2.0V)

Idischg

=25℃

7.5

low

to T

high

7.2

Note: 1. Maximum Package power dissipation limits must be observed.

2. Adjust V

above the Start-Up threshold before setting to 15V.

3. Low duty cycle pulse technique are used during test to maintain junction temperature as

low

= -20℃

high

= +85℃

4. This parameter is measured at the latch trip point with V

= 0V.

ΔV

Output Compensation

5. Comparator gain is defined as : Av =

ΔV

Current Sense Input

0.2

5.0

1.6

8.4

1.0

9.3

9.5

close to ambient as possible.

2-15

2002/01.ver.A

PJ3842B

High Performance Current Mode Controller

ELECTRICAL CHARACT ERISTICS

=15V(Note 2) , R

=10K C

=3.3nF T

low

to T

high

( Note 3) unless otherwise

Characteristic

ERROR AMPLIFIER SECTION

Voltage Feedback Input (Vo=2.5V)

Input Bias Current (V

=5.0V)

Open-Loop Voltage Gain (Vo=2.0V to 4.0V)

Unity Gain Bandwidth (T

=25℃)

Power Supply Rejection Radio (V

=12V to 25V)

Output Current

Sink (Vo=1.1V, V

=2.7V)

Source ( Vo=5.0V, V

=2.3V)

Output Voltage Swing

High State (R

=15K to ground, V

=2.3V)

Low State (R

=15K to Vref, V

=2.7V)

CURRENT SENSE SECTION

Current Sense Input Voltage Gain (Note 4&5)

Maximum Current Sense Input Threshold(Note 4)

Power Supply Rejection Radio

=12V to 25V,Note 4

Input Bias Current

Propagation Delay(Current Sense Input to Output)

OUTPUT SECTION

Output Voltage

Low State (Isink=20mA)

(Isink=200mA)

High State (Isource=20mA)

(Isource=200mA)

Output Voltage with UVLO Activated

=6.0V,Isink=1.0mA

Output Voltage Rise Time (C

=1.0nF,T

=25℃)

Output Voltage Fall Time (C

=1.0nF,T

=25℃)

UNDERVOLTAGE LOCKOUT SECTION

Start-Up Threshold

PJ3842B

Minimum Operating Voltage After Turn-On

PJ3842B

PWM SECTION

Duty Cycle

Maximum

Minimum

TOTAL DEVICE

Power Supply Current

Start-Up, V

= 14V

Operating (Note 2)

Power Supply Zener Voltage (I

=25mA)

SRR

PLH(IN/OUT)

2.85

0.9

3.0

1.0

-2.0

150

3.15

1.1

-10

300

V/V

μΑ

(UVLO)

Vth

14.5

CC(min)

8.5

11.5

DCmax

DCmin

0.25

0.5

17.5

0.1

1.6

13.5

13.4

0.1

0.4

2.2

1.1

150

VOL

PSRR

sink

Source

2.42

0.7

2.0

-0.5

5.0

2.5

-0.1

1.0

-1.0

6.2

0.8

2.58

-2.0

1.1

μΑ

MHz

Symbol

Min

PJ3842B

Typ

Unit

Max

3-15

2002/01.ver.A

PJ3842B

High Performance Current Mode Controller

FIGURE 1- OUTPUT DEAD TIME versus

OSCILLATOR FREQ UENCY

FIGURE 2- TIMING RESISTOR versus

OSCILLATOR FREQ UENCY

FIGURE 3-OSCILLATOR DISCHARGE CURRENT

versus TEMPERATURE

FIGURE 4-MAXIMUM OUTPUT DUTY CYCLE

versus TIMING RESISTOR

FIGURE 5-ERROR AMP SMALL SIGNAL

TRANSIENT RESPONSE

FIGURE 6-ERROR AMP LARGE SIGNAL

TRANSIENT RESPONSE

4-15

2002/01.ver.A

PJ3842B

High Performance Current Mode Controller

FIGURE 7-ERROR AMP OPEN-LOOP GAIN AND

PHASE versus FREQ UENCY

FIGURE 8-CURRENT SENSE INPUT THRESHOLD

versus ERROR AMP OUTPUT VOLTAGE

FIGURE 9-REFERENCE VOLTAGE CHANGE

versus SOURCE CURRENT

FIGURE 10-REFERENCE SHORT CIRCUIT

CURRENT versus TEMPERATURE

FIGURE 11- REFERENCE LOAD REGULATION

FIGURE 12-REFERENCE LINE REGULATION

5-15

2002/01.ver.A

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