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參數(shù)資料
| 型號(hào)： | UCC1839 |
| 廠商： | Texas Instruments, Inc. |
| 元件分類： | DC/DC變換器 |
| 英文描述： | RSO-S_D(Z) Series - Econoline Regulated DC-DC Converters; Input Voltage (Vdc): 12V; Output Voltage (Vdc): 05V; Power: 1W; 2:1 and 4:1 Wide Input Voltage Ranges; 1kVDC, 2kVD & 3kVDC Isolation; UL94V-0 Package Material; Continuous Short Circuit Protectionwith Current Foldback; Low Noise; No External Capacitor needed; Efficiency to 83% |
| 中文描述： | 二次側(cè)平均電流模式控制器 |
| 文件頁(yè)數(shù)： | 1/6頁(yè) |
| 文件大小： | 210K |
| 代理商： | UCC1839 |
UCC1839
UCC2839
UCC3839
04/99
FEATURES
Practical Secondary Side Control of
Isolated Power Supplies
Provides a Self Regulating Bias
Supply From a High Input Voltage
Using an External N-Channel
Depletion Mode FET
Onboard Precision, Fixed Gain,
Differential Current Sense Amplifier
Wide Bandwidth Current Error
Amplifier
5V Reference
High Current, Programmable Gm
Amplifier Optimized to Drive
Opto-couplers
Secondary Side Average Current Mode Controller
BLOCK DIAGRAM
UDG-97011
DESCRIPTION
The UCC3839 provides the control functions for secondary side average
current mode control in isolated power supplies. Start up, pulse width
modulation and MOSFET drive must be accomplished independently on
the primary side. Communication from secondary to primary side is antici-
pated through an opto-isolator.
Accordingly, the UCC3839 contains a fixed gain current sense amplifier,
voltage and current error amplifiers, and a Gm type buffer/driver amplifier
for the opto-isolator. Additional housekeeping functions include a precision
5V reference and a bias supply regulator.
Power for the UCC3839 can be generated by peak rectifying the voltage of
the secondary winding of the isolation transformer. From this unregulated
voltage, the UCC3839’s bias supply regulator will generate its own 7.5V
bias supply using an external, N-channel, depletion mode FET.
The UCC3839 can be configured for traditional average current mode con-
trol where the output of the voltage error amplifier commands the current
error amplifier. It can also be configured for output voltage regulation with
average current mode short circuit current limiting, employing two parallel
control loops regulating the output voltage and output current independ-
ently.
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