Data Sheet

ManualsBrandsON SEMICONDUCTOR ManualsPMICsPMIC - voltage regulators - DC DC switch controllers DIP 8

October-2017, Rev. 2

Publication Order Number:

KA7553A/D

Features

• Built-in drive circuits for direct connection power

MOSFET (l

= ±1.5A)

• Wide operating frequency range (5kHz ~ 600kHz)

• Pulse by pulse over current limiting

• Over load protection

• On/off control by external trigger

• Internal UVLO

• Low standby current (typ. 90uA)

• Soft start circuit

Description

The KA7552A/KA7553A are switching power control IC

for wide operating frequency range. The internal circuits

include pulse by pulse current limiting, protection, on/off

control by external trigger, low standby current, soft start,

and high current totempole output for driving a POWER

MOSFET. Maximum duty of the KA7552A is 70% and the

KA7553A is 46%. When duty is maximum, the input

threshold voltage of pin2 & pin8 are not same in KA7552A

and KA7553A.

8-DIP

Internal Block Diagram

OUTPUT

GND

IS(+)

0.56 ~ 0.42V

10uA

PWM

2.4V

1.9V

O.C.P

0.24V

4.3K

OFF

3.6V

2.8V

OSC

UVLO

BIAS

(4V)

KA7552A/KA7553A

SMPS Controller

Summary of content (6 pages)

PAGE 1
KA7552A/KA7553A SMPS Controller Features Description • Built-in drive circuits for direct connection power MOSFET (lO = ±1.5A) • Wide operating frequency range (5kHz ~ 600kHz) • Pulse by pulse over current limiting • Over load protection • On/off control by external trigger • Internal UVLO • Low standby current (typ. 90uA) • Soft start circuit The KA7552A/KA7553A are switching power control IC for wide operating frequency range.
PAGE 2
KA7552A/KA7553A Absolute Maximum Ratings Parameter Symbol Value Unit VCC 30 V Supply voltage IO ±1.5 A Input voltage at overcurrent detection pin VIN(IS) -0.
PAGE 3
KA7552A/KA7553A Electrical Characteristics (Continued) (VCC = 18V, FOSC = 135kHz, TA = 25°C, unless otherwise specified) Parameter Symbol Conditions Min. Typ. Max. Unit Start-up threshold voltage VTH(ST) - 15.5 16.0 16.5 V Minimum operating voltage VOPR(Min) - 8.20 8.70 9.20 V VHYS - 6.40 7.30 8.20 V VPIN8 = 0V -15 -10 -5 uA UNDER VOLTAGE LOCKOUT SECTION Hysteresis ON/OFF CONTROL SECTION Source current(pin8) ISOURCE(CS) On threshold voltage VTH(ON) VPIN8 : OFF->ON 0.
PAGE 4
KA7552A/KA7553A Mechanical Dimensions Package Dimensions in millimeters #5 1.524 ±0.10 0.060 ±0.004 #4 0.018 ±0.004 #8 2.54 0.100 9.60 MAX 0.378 #1 9.20 ±0.20 0.362 ±0.008 ( 6.40 ±0.20 0.252 ±0.008 0.46 ±0.10 0.79 ) 0.031 8-DIP 5.08 MAX 0.200 7.62 0.300 3.40 ±0.20 0.134 ±0.008 +0.10 0.25 –0.05 +0.004 0~15° 0.010 –0.002 www.onsemi.com 4 3.30 ±0.30 0.130 ±0.012 0.33 MIN 0.
PAGE 5
KA7552A/KA7553A Ordering Information Product Number KA7552A KA7553A Package Operating Temperature 8-DIP -25 ~ +85°C www.onsemi.
PAGE 6
ON Semiconductor and are trademarks of Semiconductor Components Industries, LLC dba ON Semiconductor or its subsidiaries in the United States and/or other countries. ON Semiconductor owns the rights to a number of patents, trademarks, copyrights, trade secrets, and other intellectual property. A listing of ON Semiconductor’s product/patent coverage may be accessed at www.onsemi.com/site/pdf/Patent−Marking.pdf. ON Semiconductor reserves the right to make changes without further notice to any products herein.