Fairchild Semiconductor KA7515 Datasheet
KA7515
SMPS Controller
www.fairchildsemi.com
Features
• Good load regulation over a wide load for external
components.
• Internal soft-start for quiet start-up.
• Start-up supply current less than 1.6mA.
• Switch-oft supply current less than 10mA.
• Burst operation under short-circuit conditions
• Thermal shutdown through over-temperature.
Internal Block Diagram
Description
The KA7515 provides the necessary features to implement
switching mode power supply with a minimal external parts
count. Internally implemented circuits include 3V reference voltage block, supply voltage monitoring block to
control outpu t throug h supply vol tage and overload amplifier
block to control output by external road variation. The
KA7515 controls the power MOSFET and performs all
necessary regulation and monitoring function in free running
flyback converters.
8-DIP
1
©2000 Fairchild Semiconductor International
Rev. 5.0
KA7515
Absolute Maximum Ratings (TA=25°°°°C)
Parameter Symbol Value Unit
Supply Voltage V
Collector Supply Voltage V
Output current, Sink or Source I
Operating Temperature T
Storage Temperature T
CC
C
O
OPR
STG
20 V
13 V
12 mA
-25 ~ + 85 °C
-65 ~ + 150 °C
Electrical Characteristics (T
Parameter Symbol Conditions Min. Typ. Max. Unit
Start-up Hysteresis
Start-up Current (1) I
Start-up Current (2) I
Start-up Current (3) I
Switch On Voltage V
Switch Off Voltage V
Switch On Current I
Switch Off Current I
Voltage Limiter (Pin 2) V
Voltage Limiter (Pin 3) V
Control Input Voltage V
Gain In Control Range G
Basic Value V
Maximum Peak Value V
Overload Range Upper Limit V
Overload Range Lower Limit V
Gain In Overload Range G
Input Current I
In Short-Circuit Operation
Peak Value (1) V
Peak Value (2) V
Output Pulse Width t
Output Pulse Width t
Current Consumption (1) I
Current Consumption (2) I
Overload Point -I
V(CTRL)
V(OVER)
= 25°°°°C)
A
1 V6 = 5V - 0.5 0.75 mA
ST
2 V6 = 8V - 1.0 1.5 mA
ST
3 V6 = V
ST
6E
6A
6E
6A
2(MAX)
3(MAX)
I(CTRL)
6E
V1 = V4 = V8 = GND 111213 V
V1 = V4 = V8 = GND 6 6.5 7 V
V1 = V4 = V8 = GND - 9.0 12.0 mA
V1 = V4 = V8 = GND - 8.0 10.0 mA
V6 = 10V (IC Switch-Off) 5.8 6.8 7.8 V
V6 = 10V (IC Switch-Off) 5.8 6.8 7.8 V
V6 = 10V (IC Switch-On) 370 400 430 mV
-1.11.6mA
V6 = 10V (IC Switch-On) 48 51 54 dB
2B
2(MAX)
IH
IL
V6 = 10V (IC Switch-On) 0.9 1.0 1.15 V
V6 = 10V (IC Switch-On) 2.8 3.0 3.4 V
V6 = 10V (IC Switch-On) 370 400 430 mV
V6 = 10V (IC Switch-On) 60 200 290 mV
V6 = 10V (IC Switch-On) 1 2 3 dB
1
2(PK)
2(PK)
W
W
1 V
6
2 V
6
2
V6 = 10V (IC Switch-On) 90 140 180 µA
1 V1 = 3.5V 2.8 3.0 3.4 V
2 V1 = 0V 2.35 2.65 2.95 V
1 V1 = 3.5V 3.5 5 6.5 µs
2 V1 = 0V 2.5 4 5.5 µs
= 3.5V - 12 15 mA
1
= 0V - 12 15 mA
1
V3 = V4, V2 = 0V 400 660 850 µA
2
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