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CS7054 Datasheet(PDF) 3 Page - Cherry Semiconductor Corporation

Part No. CS7054
Description  Low Side PWM FET Controller
Download  6 Pages
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Maker  CHERRY [Cherry Semiconductor Corporation]
Homepage  http://www.cherrycorp.com/
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CS7054 Datasheet(HTML) 3 Page - Cherry Semiconductor Corporation

   
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Package Lead Description
PACKAGE LEAD #
LEAD SYMBOL
FUNCTION
Application Information
Oscillator
The IC sets up a constant frequency triangle wave at the
COSC lead whose frequency is determined by the external
components ROSC and COSC by the following equation:
Frequency =
The peak and valley of the triangle wave are proportional
to VCC by the following:
VVALLEY = 0.2 ´ VCC
VPEAK = 0.8 ´ VCC
This is required to make the voltage compensation func-
tion properly. In order to keep the frequency of the oscilla-
tor constant the current that charges COSC must also vary
with supply. ROSC sets up the current which charges COSC.
The voltage across ROSC is 50% of VCC and therefore:
IROSC = 0.5 ´
IROSC is multiplied by two (2) internally and transferred to
the COSC lead. Therefore:
ICOSC = ±
The period of the oscillator is:
T = 2COSC ´
The ROSC and COSC components can be varied to create fre-
quencies over the range of 15Hz to 25kHz. With the sug-
gested values of 105k½ and 390pF for ROSC and COSC
respectively, the nominal frequency will be approximately
20 kHz. IROSC, at VCC = 14V, will be 66.7 µA. IROSC should
not change over a more than 2:1 ratio and therefore COSC
should be changed to adjust the oscillator frequency.
Voltage Duty Cycle Conversion
The IC translates an input voltage at the CTL lead into a
duty cycle at the OUTPUT lead. The transfer function
incorporates Cherry SemiconductorÕs patented Voltage
Compensation method to keep the average voltage and
current across the load constant regardless of fluctuations
(VPEAK - VVALLEY)
ICOSC
VCC
ROSC
VCC
ROSC
0.83
ROSC ´ COSC
Theory Of Operation
14 Lead PDIP
1
OUTPUT
MOSFET Gate Drive
2
Gnd
Ground
3
FLT
Fault time out capacitor
4COSC
Oscillator capacitor
5ROSC
Oscillator resistor
6
CTL
Pulse width control input
7
NC
No connection
8VREG
5V linear regulator
9ISENSE-
Current sense minus
10
ISENSE+
Current sense plus
11
IADJ
Current limit adjust
12
INH
Output Inhibit
13
PGnd
Power ground for on chip clamp
14
VCC
Positive power supply input


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