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参数资料
| 型号： | TC1237EUNRT |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHED CAPACITOR CONVERTER, 170 kHz SWITCHING FREQ-MAX, PDSO10 |
| 封装： | MSOP-10 |
| 文件页数： | 5/10页 |
| 文件大小： | 1046K |
| 代理商： | TC1237EUNRT |
4
Inverting Dual (–VIN, –2VIN)
Charge Pump Voltage Converters
with Shutdown
TC1235
TC1236
TC1237
TC1235/6/7-1 3/24/00
2001 Microchip Technology Inc.
DS21371A
P2LOSS (2, 3, 4) = IOUT2
2 x R
OUT2
where ROUT2 = [ 1 / [fOSC(C2) ] + 8RSWITCH2 +
4ESRC2 + ESRCOUT2 ]
Equation 1b.
The internal switch resistance for the first stage (i.e.
RSWITCH1) is approximately 3 and the switch resistance for
the second stage (i.e. RSWITCH2) is approximately 7.
The losses in the circuit due to factor (4) above are also
shown in Equation 2a for stage 1 and Equation 2b for stage
2. The output voltage ripple for stage 1 is given by Equation
3a and the output voltage ripple for stage 2 is given by
Equation 3b.
PLOSS1 (4) = [ (0.5)(C1)(VIN
2 – V
OUT1
2 ) + (0.5)
(COUT1) (VRIPPLE1
2 - 2V
OUT1 VRIPPLE1) ] x fOSC
Equation 2a.
PLOSS2 (4) = [ (0.5) (C2) (VIN
2 – V
OUT2
2 ) + (0.5)
(COUT2) (VRIPPLE2
2 - 2V
OUT2 VRIPPLE2) ] x fOSC
Equation 2b.
VRIPPLE1 = [ IOUT1 / (fOSC) (COUT1) ] + 2 (IOUT1)
(ESRCOUT1)
Equation 3a.
VRIPPLE2 = [ IOUT2 / (fOSC) (COUT2) ] + 2 (IOUT2)
(ESRCOUT2)
Equation 3b.
Capacitor Selection
In order to maintain the lowest output resistance and
output ripple voltage, it is recommended that low ESR
capacitors be used. Additionally, larger values of C1 and C2
will lower the output resistance and larger values of COUT1
and COUT2 will reduce output ripple. (See Equations 1a, 1b,
3a, and 3b). NOTE: For proper charge pump operation,
C1 and COUT1 must have a voltage rating greater than or
equal to VIN, while C2 and COUT2 must have a voltage
rating greater than or equal to 2VIN.
Table 1a shows various values of C1 and the corre-
sponding output resistance values for VIN=5V @ +25°C for
stage 1 and Table 1b shows various values of C2 and the
corresponding output resistance values for VIN=5V @ +25°C
for stage 2. It assumes a 0.1
ESRC1, a 0.1 ESRC2, a 3
RSWITCH1, and a 7 RSWITCH2.
Table 2a shows the output voltage ripple for various
values of COUT1 and Table 2b shows the output voltage
ripple for various values of COUT2 (again assuming VIN = 5V
@ +25
oC). The VRIPPLE1 values assume a 3mA output load
current for stage 1 and a 0.1
ESRCOUT1. The VRIPPLE2
values assume a 200
A output load current for stage 2 and
a 0.1
ESRCOUT1.
Table 1a. Output Resistance vs. C1 (ESR = 0.1
). For Stage 1
C1 (
F) TC1235 R
OUT (
) TC1236 R
OUT (
) TC1237 R
OUT (
)
0.47
202
85
42
1
108
53
33
3.3
50
33
27
Table 1b. Output Resistance vs. C2 (ESR = 0.1
). For Stage 2
C2 (
F) TC1235 ROUT () TC1236 ROUT () TC1237 ROUT ()
0.1
890
342
137
0.47
239
117
74
1
140
85
65
Table 2a. Output Voltage Ripple vs. COUT1 (ESR = 0.1) For Stage 1
(IOUT1 = 3mA)
COUT1
TC1235 VRIPPLE1
TC1236 VRIPPLE1
TC1237 VRIPPLE1
(
F)
(mV)
0.47
533
183
52
1
251
86
25
3.3
76
27
8
Table 2b. Output Voltage Ripple vs. COUT2 (ESR = 0.1) For Stage 2
(IOUT2 = 200
A)
COUT2
TC1235 VRIPPLE2
TC1236 VRIPPLE2
TC1237 VRIPPLE2
(
F)
(mV)
0.1
167
57
16
0.47
36
12
3.4
1
17
5.8
1.6
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