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Reliability Data
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Features
- Input Voltage Range: 8.5V to 100V
- Programmable Volt-Second Clamp
- High Efficiency Control: Active Clamp, Synchronous Rectification, Programmable Delays
- Short-Circuit (Hiccup Mode) Overcurrent Protection
- Programmable Soft-Start/Stop
- Programmable OVLO and UVLO with Hysteresis
- Programmable Frequency (100kHz to 500kHz)
- Synchronizable to an External Clock
Typical Application
Description
The LT®3753 is a current mode PWM controller optimized for an active clamp forward converter topology, allowing up to 100V input operation.
A programmable volt-second clamp allows primary switch duty cycles above 50% for high switch, transformer and rectifier utilization. Active clamp control reduces switch voltage stress and increases efficiency. A synchronous output is available for controlling secondary side synchronous rectification.
The LT3753 is available in a 38-lead plastic TSSOP package with missing pins for high voltage spacings.
TSSOP-38
Package Variations and Pricing
| Part Number | Package | Pins | Temp | Price (1-99) |
Price (1k)* |
|---|---|---|---|---|---|
| LT3753EFE#PBF | TSSOP | 38 | E | $4.29 | $3.19 |
| LT3753EFE#TRPBF | TSSOP | 38 | E | $3.25 | |
| LT3753HFE#PBF | TSSOP | 38 | H | $5.13 | $3.80 |
| LT3753HFE#TRPBF | TSSOP | 38 | H | $3.86 | |
| LT3753IFE#PBF | TSSOP | 38 | I | $4.70 | $3.51 |
| LT3753IFE#TRPBF | TSSOP | 38 | I | $3.57 | |
| LT3753MPFE#PBF | TSSOP | 38 | MP | $12.69 | $9.80 |
| LT3753MPFE#TRPBF | TSSOP | 38 | MP | $9.86 |
Linear Technology offers many demo boards free of charge to qualified customers. Contact your local sales office or distributor to inquire about a demo board. Certain demo boards are also available for sale via credit card on this website. Demo boards are for evaluation purposes only. It remains the customer’s responsibility to verify proper and reliable operation in the actual end application.
| Part Number | Description | Price | Documentation |
|---|---|---|---|
| DC2050A | LT3753EFE Isolated Demo Board | Sync Forward Controller with Active Clamp, 36V ≤ VIN ≤ 72V; VOUT = 5V @ 20A | $200.00 | |
| DC2306A | LT3753EFE Isolated Demo Board | Forward Converter, 10V ≤ VIN ≤ 54V; VOUT = 48V or 54V (Jumper Selectable) @ 1.5A | $200.00 | |
| DC2324A-A | LT3753EFE Demo Board | Isolated Forward Converter, 36V ≤ VIN ≤ 72V; VOUT = 24V @ 5A | Contact Factory | |
| DC2324A-B | LT3753EFE Demo Board | Isolated Forward Converter, 18V ≤ VIN ≤ 36V; VOUT = 24V @ 5A | Contact Factory | |
| DC2324A-C | LT3753EFE Isolated Demo Board | Sync Forward Controller with Active Clamp, 9V ≤ VIN ≤ 18V; VOUT = 24V @ 4A | Contact Factory |