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GM38C45

Features: `40ns output rise and 30ns output fall times`-40° to +85°C temp. range same as standard UC284x`Low-power BiCMOS Process`Very low start-up current (50A typical)`Low operating current (4mA typical)`CMOS outputs with rail-to-rail swing`500kHz current-mode operation`Pin-for-pin compatible wi...

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SeekIC No. : 004354095 Detail

GM38C45: Features: `40ns output rise and 30ns output fall times`-40° to +85°C temp. range same as standard UC284x`Low-power BiCMOS Process`Very low start-up current (50A typical)`Low operating current (4mA t...

GM38C45 Data Sheet

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Part Number:
GM38C45
Supply Ability:
5000

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  • 1~5000
  • Unit Price
  • Negotiable
  • Processing time
  • 15 Days
Total Cost: $ 0.00

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Upload time: 2024/9/26

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Product Details

Description



Features:

`40ns output rise and 30ns output fall times
`-40° to +85°C temp. range same as standard UC284x
`Low-power BiCMOS Process
`Very low start-up current (50A typical)
`Low operating current (4mA typical)
`CMOS outputs with rail-to-rail swing
`500kHz current-mode operation
`Pin-for-pin compatible with UC3842/ 3843 / 3844/ 3845(A)
`Trimmed oscillator discharge current
`UVLO with hysteresis
`Low cross-conduction currents


Application

·Current-mode, off-line, switched-mode
·power supplies
·Current-mode, dc-to-dc converters.
·Step-down "buck" regulators
·Step-up "boost" regulators
·Flyback, isolated regulators
·Forward converters
·Synchronous FET converters


Specifications

PARAMETER SYMBOL VALUE UNIT
Zener Current
Operation at 16V may require special precautions(Note6)		 IDD 30 mA
Supply Voltage(Note 6) VDD 18 V
Switch Supply Voltage VD 18 V
Current Sense Voltage VISNS - 0.3 to + 5.5 V
Feedback Voltage VFB - 0.3 to + 5.5 V

Output Current

 IOUT 0.5 A
Storage Temperature TA - 65 to + 150 °C



Description

The GM38C4x are fixed frequency, high performance, current- mode PWM controllers. Gamma's BiCMOS devices are pin compatible with standard 384x bipolar devices but with several improvements.

Undervoltage lockout circuitry allows the '42 and '44 versions to start up at 14.5V and operate down to 9V, and the '43 and '45 versions start at 8.4V with operation down to 7.6V. All versions operate up to 16V.

When compared to bipolar 384x devices operating from a 15V supply, start-up current has been reduced to 50A typical and operating current has been reduced to 4.0 mA typical. Decreased output rise and fall times drive larger MOSFETs, and rail-to-rail output capability increases efficiency, especially at lower supply voltages. The GM38C4x also features a trimmed oscillator discharge current and bandgap reference.




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