The UC28023 and UC28025 are optimized controllers for PWM high-frequency switch-mode power supply applications with fixed frequency. The UC28023 is a single-ended topology UC28025 while providing dual alternating double-ended outputs and a single output in a full-bridge topology.
Designed as a cost-effective solution with minimal external components, the UC2802x includes an oscillator, temperature compensation reference, wide-band width error amplifier, a high-speed current-sense comparator and high-current high-efficiency totem pole output, directly driving an external MOSFET.
The protection circuitry includes a threshold current limit comparator with 1 - V, compatible with TTL shut-off ports, and a soft-start pin that will double the maximum duty cycle clamp.
Microchip Centennial Electronic Technology (Shenzhen) Co., Ltd
Address: 13H, Block A, Huaqiang Plaza, Huaqiang Road, Futian District, Shenzhen
Phone: 0755-83591082
Fax: 0755-83591083
Q Q：1051085817
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characteristic
-
Peak current mode, average current mode, or voltage mode
(with feedforward) control method
- Actual operation up to 1 MHz
- 50 - ns propagation delay to the output
- ± 1.5 peak totem pole output
- 9 V to 30 V rated operating voltage range
- Wideband error amplifier
- Fully locked logic dual-pulse suppression
- The pulse is limited by the pulse current
- Programmable maximum duty cycle control
- Undervoltage lockout and hysteresis
- Edge 5.1 - V with UVLO reference
- Same features as UC3823 and UC3825
-
apply
- Offline and DC/DC power supplies
-
The converter adopts voltage mode, peak current mode,
or average current mode control method
- Single-ended or double-switch topology design
parameter
| |
UC28025 |
| topology |
Boost, flyback, forward, full-bridge, half-bridge, push-to-pull |
| Control method |
Current mode |
| Duty Cycle (Max) (%) |
100 |
| Frequency (max) (kHz) |
1000 |
| On/off of undervoltage lockout threshold (5) |
9.2/8.4 |
| Pin/Pack |
16PDIP，16SOIC |
| (#) Regulated output |
2 |
| Operating Temperature Range (°C) |
-40 to 105 |