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PDF UC2825 Data sheet ( Hoja de datos )
| Número de pieza | UC2825 | |
| Descripción | High Speed PWM Controller | |
| Fabricantes | Unitrode | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de UC2825 (archivo pdf) en la parte inferior de esta página. Total 8 Páginas | ||
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High Speed PWM Controller
UC1825
UC2825
UC3825
FEATURES
• Compatible with Voltage or Current Mode
Topologies
• Practical Operation Switching Frequencies
to 1MHz
• 50ns Propagation Delay to Output
• High Current Dual Totem Pole Outputs
(1.5A Peak)
• Wide Bandwidth Error Amplifier
• Fully Latched Logic with Double Pulse
Suppression
• Pulse-by-Pulse Current Limiting
• Soft Start / Max. Duty Cycle Control
• Under-Voltage Lockout with Hysteresis
• Low Start Up Current (1.1mA)
DESCRIPTION
The UC1825 family of PWM control ICs is optimized for high fre-
quency switched mode power supply applications. Particular care
was given to minimizing propagation delays through the comparators
and logic circuitry while maximizing bandwidth and slew rate of the
error amplifier. This controller is designed for use in either current-
mode or voltage mode systems with the capability for input voltage
feed-forward.
Protection circuitry includes a current limit comparator with a 1V
threshold, a TTL compatible shutdown port, and a soft start pin which
will double as a maximum duty cycle clamp. The logic is fully latched
to provide jitter free operation and prohibit multiple pulses at an out-
put. An under-voltage lockout section with 800mV of hysteresis as-
sures low start up current. During under-voltage lockout, the outputs
are high impedance.
These devices feature totem pole outputs designed to source and
sink high peak currents from capacitive loads, such as the gate of a
power MOSFET. The on state is designed as a high level.
• Trimmed Bandgap Reference (5.1V ±1%)
BLOCK DIAGRAM
3/97
UDG-92030-2
1 page  
Oscillator Circuit
UC1825
UC2825
UC3825
Deadtime vs CT (3k ≤ RT ≤ 100k)
Timing Resistance vs Frequency
Synchronized Operation
Two Units in Close Proximity
160
140
120
100
80
10k
Deadtime vs Frequency
1.0nF
470pF
100k
FREQ (Hz)
1M
Generalized Synchronization
5
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet UC2825.PDF ] | |
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