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Part Number: GM38C43
Description: The GM38C4x are fixed frequency, high performance, current- mode PWM controllers. Gamma's BiCMOS devic...
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GM38C43
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DataSheet
General Description
GM38C43 General 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.
GM38C43 Maximum Ratings
| 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 |
GM38C43 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
`-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
GM38C43 Typical 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
·power supplies
·Current-mode, dc-to-dc converters.
·Step-down "buck" regulators
·Step-up "boost" regulators
·Flyback, isolated regulators
·Forward converters
·Synchronous FET converters
GM3110
PDF/DataSheet Download
- Datasheet: GM3110
- File Size: 1412672 KB
- Manufacturer: ETC [ETC]
- Click here to Download
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GM38C43 Relative Products
GM38C42
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 of GM38C4xallows the '42 and '44 versi...
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