LB1820 データシートの表示（PDF） - SANYO -> Panasonic
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LB1820 Datasheet PDF : 7 Pages
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LB1820
PWM Frequency Setting
The PWM frequency is determined by the resistor and capacitor connected to the CR pin. When a resistor is connected to the
FGIN+ pin, the PWM frequency can be roughly calculated by the following formula:
fPWM 6 1 ÷ (1.2 × C × R)
The resistor must not be less than 30 kΩ. It is desirable for the PWM frequency to be about 15 kHz.
Quartz Oscillator
An oscillator, capacitor and resistor are to be connected to the quartz oscillator. When selecting the oscillator and the external
capacitor and resistor, always obtain approval from the manufacturer of the oscillator in order to avoid problems.
(Circuit with external quartz oscillator)
External constants (reference values)
Xtal (MHz)
3 to 4
4 to 5
5 to 7
7 to 10
C1 (pF)
39
39
39
39
C2 (pF)
82
82
47
27
However, use a crystal such that the base wave
fO impedance : 3fO impedance = 1 : 5 or more
R (kΩ)
0.82
1.0
1.5
2.0
When inputting external signals (of several MHz) to the quartz oscillator, connect external components as shown in the diagram
below.
fIN = 1 to 8 MHz
Input signal level High level voltage: 4.0 V min.
5 V pin
Low level voltage: 1.5 V max.
Ra = 2 kΩ, Rb = 1 kΩ (reference values)
Xtal pin
Input
No products described or contained herein are intended for use in surgical implants, life-support systems, aerospace equipment,
nuclear power control systems, vehicles, disaster/crime-prevention equipment and the like, the failure of which may directly or
indirectly cause injury, death or property loss.
Anyone purchasing any products described or contained herein for an above-mentioned use shall:
1 Accept full responsibility and indemnify and defend SANYO ELECTRIC CO., LTD., its affiliates, subsidiaries and distributors
and all their officers and employees, jointly and severally, against any and all claims and litigation and all damages, cost and
expenses associated with such use:
2 Not impose any responsibility for any fault or negligence which may be cited in any such claim or litigation on SANYO
ELECTRIC CO., LTD., its affiliates, subsidiaries and distributors or any of their officers and employees jointly or severally.
Information (including circuit diagrams and circuit parameters) herein is for example only; it is not guaranteed for volume
production. SANYO believes information herein is accurate and reliable, but no guarantees are made or implied regarding its use
or any infringements of intellectual property rights or other rights of third parties.
This catalog provides information as of April, 1996. Specifications and information herein are subject to change without notice.
No.3302-7/7
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