NCP1253: PWM Controller, Current Mode, for Offline Power Supplies
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The NCP1253 is a highly integrated PWM controller capable of delivering a rugged and high performance offline power supply in a tiny TSOP-6 package. With a supply range up to 28 V, the controller hosts a jittered 65 kHz or 100 kHz switching circuitry operated in peak current mode control. When the power on the secondary side starts to decrease, the controller automatically folds back it's switching frequency down to a minimum level of 26 kHz. As the power further goes down, the part enters skip cycle while limiting the peak current. To avoid sub harmonic oscillations in CCM operation, adjustable slope compensation is available via the series inclusion of a simple resistor in the current sense signal. Besides the auto-recovery timer-based short-circuit protection, an Over Voltage Protection on the Vcc pin protects the whole circuitry in case of optocoupler destruction or adverse open loop operation.
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Technical Documentation & Design Resources
Design & Development Tools (1) | Package Drawings (1) |
Data Sheets (1) |
Availability & Samples
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Specifications
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Case Outline |
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NCP1253ASN100T1G | Obsolete |
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NCP1253 | TSOP-6 | 318G-02 | 1 | 260 | Tape and Reel | 3000 | |||||||||
NCP1253ASN65T1G | Obsolete |
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NCP1253 | TSOP-6 | 318G-02 | 1 | 260 | Tape and Reel | 3000 | |||||||||
NCP1253BSN100T1G | Active |
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NCP1253 | TSOP-6 | 318G-02 | 1 | 260 | Tape and Reel | 3000 | $0.2
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NCP1253BSN65T1G | Active |
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NCP1253 | TSOP-6 | 318G-02 | 1 | 260 | Tape and Reel | 3000 | $0.2
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Market Leadtime (weeks) | : | Contact Factory |
Market Leadtime (weeks) | : | Contact Factory |
Market Leadtime (weeks) | : | 4 to 8 |
Market Leadtime (weeks) | : | 4 to 8 |
Product
Description
Pricing ($/Unit)
Compliance
Status
Topology
Control Mode
fsw Typ (kHz)
Stand-by Mode
UVLO (V)
Short Circuit Protection
Latch
Soft Start
VCC Max (V)
Drive Cap. (mA)
Package Type
Case Outlines
318G-02
Support |