NJM2352D NJR, NJM2352D Datasheet - Page 10

• Manufacturer Part Number: NJM2352D
• Description: IC LOW POWER SW REG 8 DIP
• Manufacturer: NJR
• Type: Step-Down (Buck), Step-Up (Boost), Invertingr

Specifications of NJM2352D

• Internal Switch(s): No
• Synchronous Rectifier: No
• Number Of Outputs: 1
• Voltage - Output: 5V, 9V, 24V
• Frequency - Switching: 50kHz
• Voltage - Input: 2.6 ~ 24 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Through Hole
• Package / Case: 8-DIP
• Power - Output: 300mW
• Operating Temperature Range: - 40 C to + 85 C
• Mounting Style: Through Hole
• Duty Cycle (max): 50 %
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Current - Output: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

■ MINIMUM OPERATING VOLTAGE
design. Less than this minimum operating voltage, internal switching transistor becomes on, and the surge-like high
current flows into it especially in Step-Up or Inverting application.
■ OSCILLATOR
wave B is between 1 V
■ AMPLIFIER
recommended more than 100kΩ.
■ SWITCHING TRANSISTOR
operate unordinary by reason of parasitic effect in it. And so put SBD in between PIN 3 and ground when you drive
directory coil with internal switching transistor.
■ DETECTION CIRCUIT OF INPUT VOLTAGE DROP
turns on. The specified voltage is decided by internal reference voltage and outer resistors ratio.
chattering. Transistor Q56 becomes off condition when PIN 1 voltage is lower than about 0.2V. It is recommendable to
put about 1µF to PIN 1 in actual application to avoid switching noise.
- 10 -
Minimum operating voltage is V
Oscillator frequency is decided by putting a capacitor into PIN 2. The amplitude of both square wave A and triangular
AMP source current it 20 µA max. and so the feedback resistor R
When the negative voltage more than 0.5V absolute value based on ground level is applied, the NJM2352 may
When input voltage becomes lower than specified voltage, transistor Q
When - input voltage becomes lower than + input voltage, PIN 1 of COMP-3 sinks about 1µA and thus prevents
V
TH
= V
REF
BE
(1+R2/R5) + R2 x 0.5µA
and 3V
NJM2352
BE
.
+
≥ 2.6V at 25°C and its temperature coefficient is negative. Be careful when you
1
56
to be connected to PIN 6 and PIN 7 are
switches on and indicative device like LED
Ver.2003-07-18